Which Density is Right for You?

Peter Product Information 103 Comments

Why are SumoSprings different colors?

The different SumoSprings’ colors identify their density. SumoSprings come in three different densities: blue SumoSprings are -40, black SumoSprings are -47, and yellow SumoSprings are -54.

Blue – 40

Blue -40 density captures more air in the millions of micro-cellular bubbles, creating an air spring suitable for light and medium duty applications.

Black – 47

Black -47 density balances the amount of urethane and air bubbles to create an air spring suitable for light, medium, and heavy duty applications.

Yellow – 54

Yellow -54 density traps a smaller amount of air in the air spaces creating a more dense air spring suitable for medium and heavy duty applications.

Class A Motorhome Applications

For Class A motorhomes built on the Ford F-53 chassis, our engineers have made the selection process simple. For the front, the most beneficial SumoSprings kit, and sole option, is the -40 (Blue). For the rear, you will see either the -40 or the -54 (Yellow). The density for rear kits primarily depends on the coach’s GVWR. The -40 is listed for 16k-18k coaches, while the -54 is listed for 20k-26k coaches.

Recreational and Commercial Applications

For all other applications, whether commercial or recreational, the options can broaden, making the decision just a bit more tricky. Something to keep in mind, is the fact that not every density is available for every application. On the other hand, some applications list all three densities as a viable option. So, in the case where you have multiple densities to select from, which density is right for you?

What are you trying to accomplish?

The main question to ask yourself is, “What are you trying to accomplish by enhancing your factory suspension?” Say the main goal is comfort and ride quality. You may not be towing or hauling additional weight with your Toyota Tacoma, but a smoother ride over potholes, speed bumps, dips, driveways, etc., on your way to the grocery store would make for a much more enjoyable driving experience. This is an example of a light duty application; -40 is the recommended density. The -40 captures the most air of the three densities, creating a soft cushion effect.

Okay, let’s step it up now. You’re still after the comfort, and ride quality, except now you own a boat you would like to tow to the lake once a month. Towing something relatively small may not seem like an issue for your vehicle, but if it is experiencing rear-end sag, there are a few negatives to think about, including premature wear on original components. A boat is just one example. You may be hauling a motorcycle, a jet ski, or an ATV. This is perfect for the -47, recommended for light and medium duty applications. The -47 is a great solution for Class B and Class C motorhomes as well. The balance of urethane and air bubbles is appropriate for medium to heavy duty applications. An example here might be a Mercedes-Benz Sprinter based motorhome.

Last but not least, the -54. The -54 traps the least amount of air, out of all three densities. This makes for a more dense air spring, suitable for commercial use, or motorhomes on the heavier side. Although SuperSprings are more common in commercial applications, SumoSprings can be an option as well. Using both SuperSprings and SumoSprings is the preferred choice for commercial applications.

Comments 103

  1. Post

    Hi there!

    Thank you for your question.
    We actually do not perform installations at our factory. You are more than welcome to stop by and place an order, or pick some SumoSprings up if you place an order on our website though. If you already have them however, we can assist with finding an installer near you. Either way, let me know so we can help you get some SumoSprings on your motorhome!

  2. I recently purchased a 1988 Minnie Winnie Winnebago. Please provide me application info for a suspension upgrade. Vehicle has 60K miles. Thank you.

    1. Post

      Hi Joey,

      Thank you for inquiring about SumoSprings. I’ll need a bit more information from you, in order to ensure the proper recommended part numbers. Can you please let me know the year, make, and model of the chassis your Winnebago is built on top of?

  3. I’m considering adding rear sumosprings and front coil sumosprings to my 2019 Winnebago Travato 59KL. I understand that you can gain a slight increase in rear ground clearance of around 1-1.5 inches. I also understand that a smoother ride with an increase in stability and control can be gained. My question is which density of sumosprings should I have installed? GVWR IS 9350 lbs — 4630 lbs-front/5291 lbs-rear. Occupant and cargo carrying capacity (occc) is approximately 1900 lbs. GCWR is 11500 lbs.

    1. Hi Steve, we have spent time communicating with a lot of Travato owners. Quite honestly, both the SSR-313-47 and SSR-313-54 have great reviews. The more popular seems to be the -54 amongst Travato owners, but everyone has their own personal preference. I would encourage you to ask fellow Travato owners. They have a great Facebook Group community you can join. They also have a website with resources, including an in depth FAQ on SumoSprings. I encourage you to check it out, as it will help answer your question: https://travato.group/wp-content/uploads/2017/10/Travato-and-SumoSprings-FAQ.pdf. In response to your comment about ground clearance. Remember, we are not lifting your van, we are reducing the amount of sag. So, yes. Travato owners do report varying ground clearance increases, but, it varies depending on the amount of weight causing the sag, and the age of the spring pack assembly. Hope this resource helps. Please feel free to give me a call in the office or email to discuss further.

  4. I have a 2015 tundra 8 ft bed double cab. about 5 times a year a I haul a load of firewoodl I can feel suspension bottom on bumps. truck sags but actually handles fairly good. would yellow be overkill or would I be happier with black?
    Thank you.
    Mark Rogers

    1. Post

      Hello Mark,
      Thank you for your question. The material of the -54 density is more suited for commercial, or heavier applications. Since you only haul about 5 times a year, I’d say the -54 would be a bit more than what you need. Especially during all the time you aren’t loaded with the firewood. This is why I recommend the SSR-610-47 instead https://www.superspringsinternational.com/shop/SSR-610-47/
      Let me know if you have any other questions!

      1. I have a 2018 tundra trd 4×4 leveled with Bilstein 5100 all around I tow a 4000 lb Starcraft travel trailer
        which sumo spring would you recommend

        1. Mark,

          Thank you for your entry, for this application I would recommend the SSR-610-40. The reasoning behind this is the 4000lb trailer’s hitch weight is normally between 10-15%. If we were to go with 15% that would put it at around 600lbs. The SSR-610-40 is rated at 1000lbs of capacity at 50% compression. This will provide you with enough support, and will not affect the unloaded ride. If you have any questions please let me know.

          Thank you

  5. I am thinking about adding some springs to a 2011 Ford Thor Freedom Elite Class RV / E350 chassis. I have done some improvements to help with steering wandering. I changed all shocks to Bilstein HD, added a front sway bar, and steering dampner. The rear is factory sway bar. I believe my gross weight is 11.5K. I have not weighed my coach loaded up. I was thinking of air bags since the rear seems to sag but was interested in sumo springs. The Rv has about 35k miles.

    1. Hello Pat,

      Thank you for your question.

      We have some great options for both the front and the rear of your coach.

      Front – SSF-106-40

      Rear- SSR-106-40-1


      Rear- SSR-106-47-1

      The SSR-106-40-1 is designed to provide great stability as it attaches to both the frame and axle. It is also made from our light duty density SumoSprings (Blue) so it will give you a soft feel to the ride.
      The SSR-106-47-2 is a great option if your RV is fully loaded and you tow behind it as well. The SSR-106-47-2 is made of our medium duty density SumoSprings (Black) provides a 4,600 pounds capacity at 50% compression and will also give you a soft feel to the ride as well. The difference in this case of the feel of ride between the -40 & -47 is minuscule.

      There is a caveat as you will need to have a minimum of 7″ of clearance from the side wall of the tire to the frame.

      If that is the case these two will be your best options.

      If not, we can further discuss other options for the rear at least.

      Please let me know if you have any questions!

  6. Hi , I have a 3/4 ton f-250 which playload is between 3500 and 4000 pounds, how ever I’m putting a truck slide in camper which weight is close to 2000 pounds! On this case witch color of spring you recommend? “Camper goes on top of truck”!

    1. Post

      Hello Sid,

      Thank you for contacting us. The part number also depends on the year of your truck. We tend to recommend the -47 SumoSprings for recreational applications, and the -54 SumoSprings for commercial applications. However, there are a few examples of the -54 being more popular even in recreational applications (Mercedes-Benz Sprinter, Dodge ProMaster). What is the year of your Ford F-250?

  7. Hello,

    I have a 2009 Freightliner Sprinter 3500 Dually. It’s used as a shuttle and has a capacity of 17 passengers. I would like to provide a better ride for my clients, less bumpy and smoother ride. We are not always at capacity so I am not sure what is a good balance in choice of product to add. I’m afraid that a to rigid product will be bad for a less loaded shuttle. It does not have the 2 inch additional block on the axle and it has an all stock suspension. What’s your recommendation?

    1. Angel,

      Thank you for your question.

      For your passenger van we have SumoSprings for the front and rear.

      Front – SSF-106-40

      Rear- SSR-338-47

      These two parts are used on RV’s made to provide better stability and ride comfort. Since your passenger van isn’t as loaded as an RV would be. This kit will for allow for an even better stability.

      Please let me know if you have any questions.

  8. 2000 dodge ram 2500 2wd. I pull a 8300 lb travel trailer. Would the sumospring help the ride and if so which one would be the best?

    1. Post

      Hello Roger,

      The earliest year SumoSprings are available for a Dodge Ram 2500 is 2003.

      However, SuperSprings can still assist, especially with load-leveling ability. As a by-product of the design, SuperSprings also reduce sway by up to 30%, definitely beneficial to the ride.

      If your truck does not sag while hooked up to the trailer, I recommend going with SSA40

      If it does sag, then I recommend SSA22

      Please let us know if you have any questions at all.

  9. Thanks for the informative write-up. Towing vehicles is something that always requires great suspension, so we’re always looking to enhance when it makes sense. Cheers.

  10. I have a 2016 tacoma four door long box that I am considering putting the Sumo rear springs on. I occasionally haul a heavy load of firewood or building materials maybe two or three times a year. I want to still have a good ride when empty but would like to reduce sway with a heavy load. Would you recommend the 612-40 or the 612-47 springs

  11. Should I use SSR 106-40-1 or the -2 for my 2017 Ford E350 (Coachmen Leprechaun)? One is a single piece and the other is two-piece to allow more travel. I already have the SSF 106-40 on the front. Thanks.

    1. Post

      Hi Dave,

      Thank you for your question.

      For a vehicle with a constant load, such as an RV, the Maxim kit (one-piece unit) is recommended.
      For a vehicle with a load that frequently changes, the Rebel kit (two-piece unit) is recommended.

      The additional increase in stability, and handle of the vehicle provided by the Maxim generally supersedes the travel ability of the rear suspension on an application such as an RV.

  12. I have a 2018 PleasureWay Ascent on a 2017 Mercedes-Benz Sprinter 2500 chassis, which I’ve had for 15 months and about 8600 miles. Frankly it rides very well under most circumstances.

    However, I often carry my Vespa scooter on a rack on the hitch, which adds 300# which sticks out about 2’ behind the back bumper. There have been a few times in which I’ve gone over bumps such as railroad tracks with the scooter on there, and I could feel the axle hit the factory bump stops, not hard, but definitely hitting.

    Also, although I haven’t yet done so, I also plan to tow my boat, which weighs almost 4000# and has a 400# hitch weight. I’ll use a weight distribution hitch, which I have used with other tow vehicles.

    So after looking at your website and some of your videos, I think your SumoSprings that replace the rear axle bump stops would be a good thing to install. Do you agree? Thanks.

    1. Cary,

      Thank you for your entry. I do believe that the solo bump stops will help you in this situation. I would recommend part number SSR-330-47, this will provide you with ample amount of support, while still keeping the factory ride on the springs. If you have any questions please let me know. My email is [email protected]

      Thank you,

      Mac Tackett

  13. Hello,

    I have a 2018 F-250. I use it to tow a gooseneck trailer with a pin weight of around 2,000 lbs. the truck sags with this trailer, but not an extreme amount. I do not tow this trailer everyday but do pull it about 4-6 days a month.

    I see two options for my truck – the 127-47 (black) with a 1,500 lb capacity and the 127-54 (yellow) with the 2,800 lb capacity. I am a bit confused on which to choose. Are the pound ratings you specify for the load, or what the sumo springs themselves support? By that I mean my 2,000lb load is over the 1,500 lb rating of the 127-47 but I assume my factory springs are carrying the bulk of the weight already and I doubt the sumos will be carrying over 1,500lbs themselves.

    1. Brandon,

      The SumoSprings work in conjunction with your current suspension on your truck. The 1500lbs would be in addition to what your truck can currently tow. Do you have a 2 or 4 wheel drive truck? We have a new rebel kit that would provide you with 2600lbs and is made from our softest material. Since you are not towing at all time this rebel kit will not affect your unloaded ride and could actually cushion it. I would recommend the SSR-128-40-2 if you have a single rear wheel 4×4, or the SSR-129-40-2 if you have a 4×2.

  14. Hello

    I have a 2018 Jayco Greyhawk class C with the JRide suspension. I am considering installing the -47 spring in the rear of my coach for 2 reasons. The first being to help gain a little height while towing my 7×14 cargo trailer and the second for ride help. Reason i am looking for little additional height is that the stock suspension with trailer loaded is a bit low and the hitch at the ball, scrapes the ground on slight inclines. I wish to eliminate this problem. Is this the correct helper spring i should be considering? Also which spring should i pair up with it for the front of the coach for the best balance

    1. Post

      Hey Bruce,

      My name is Peter. Are you looking to reduce the amount of sag your truck experiences, or add to the stock ride height? Also, what is the year, make, and model of the chassis your Jayco is built on?

  15. I have a 2013 tundra and I tow a 16 ft bass boat occasionaly. I have stock shocks on the rear. would like to know what type of sumo springs to use. i want a smoother ride when i’m not towing. also should i get a swaybar to go along with these springs. will it make the ride to stiff with that combo? one more thing i have Bilstein 5100 adjustable leveler schocks on the front. i was thinking about getting rid of those because they are to stiff and going back to the stock struts which are supposed to be a softer ride compared to the bilsteins. i want the front end a little higher to level the rake from the rear. so i thought about having a 1 inch spacer installed on top of strut. but i am worried that it to might be to stiff because of the lift. do your front jounce bumpers raise the front end up and does it affect the ride?

    1. Post

      Hi Bob,

      Thank you for your questions, my name is Peter here. Unfortunately we do not manufacture SumoSprings for the front of a 2013 Toyota Tundra. We might have the Coil SumoSprings available for the front though. Is your truck 4×2 or 4×4?

      For the rear, I recommend SSR-610-40. This is the SumoSprings Solo kit, designed to replace and upgrade the original bump stop. Since you only tow occasionally, we want to keep your unloaded ride quality in mind. This is why I recommend the -40 density (blue), as it is the softest density we offer. Although it is the softest, the SSR-610-40 still provides 1,000 pounds of capacity at 50% compression! Take a look here, and let me know what you think: https://www.superspringsinternational.com/shop/SSR-610-40/

      Thanks again Bob!

  16. I have a 2011 Winnebago Vista 30 w on a Ford f53 chassis with a 190 inch wheel base, the coach has 16000 miles one it. I would like to know what you would recommend to make it ride a lot smoother on the highway. I feel all the joints in the road. It has a very harsh ride. Thank you Kennard mertz

    1. Hello Kennard,

      Thank you for contacting us. We would recommend out SumoSprings to smooth out your ride. To get you the correct part numbers, may I please have your GVWR (gross vehicle weight rating)?

      Thank you,

      [email protected]

  17. I have a 2017 winniebago navion on a 3500 sprinter chassis. Which front and rear sumo springs would i need and where can i have them installed in my area. Laguna Niguel CA 92677. Can I order from you and how much do they cost.

    1. Post

      Hi Ray,

      Peter with the Sales and Service Team here, thank you for your question. I am going to presume your Sprinter 3500 is 4×2, and not 4×4. With that being said, here are the part numbers I recommend for you:

      SSF-106-40 – $173.75

      **If you do not tow anything with your Sprinter
      SSR-338-47 – $241.25

      If you do tow with your Spritner

      This is only if your Sprinter is 4×2. Let me know if yours is 4×4, or if you have any questions!

  18. Hi, we have a 2019 Ram 1500, rated to tow 11,400 lbs., with a 300 lb. canopy. We have a 4800 lb. boat on a 1100 lb. trailer, which sumospring will help while towing and ride well when not towing?

  19. Post

    Hi Ed,

    Thanks for your question. We have one SumoSprings type, in two densities available. Here is how I recommend which kit to go with:

    If your truck is unloaded more than not, let’s say about 80% of the time unloaded and 20% of the time loaded, go with the SSR-307-40 – https://www.superspringsinternational.com/shop/SSR-307-40/

    If it is the opposite, and your truck is loaded up more than unloaded, then go with the SSR-307-47 https://www.superspringsinternational.com/shop/SSR-307-47/

    Let me know if you have any questions Ed!

    1. Peter,
      Thanks for the quick reply … would the SSR-307-47 cause the ride to change when not towing? My concern is that the SSR-307-40 will let the rear end of the truck sag when towing(and the bed is full of gear).
      Thanks for the help

      1. Post


        The idea behind SumoSprings is not to completely eliminate sag. Suspension is designed to naturally articulate. SumoSprings work in conjunction with the original equipment to create a more smooth, and assisted comfortable ride. The -40 is soft enough to improve unloaded ride quality, but dense enough to provide a noticeable improvement while your truck is loaded. The -47 will obviously provide more capacity, but the unloaded ride quality will definitely be more “firm.” Now, my idea of comfort might very well be different than yours, but the feedback I’ve received over the years overwhelmingly support the -40 unloaded ride quality.

  20. Hi there,

    I have a 2002 Ford E350 Super Duty that I am converting into a camper van. I will be adding a lot of weight the the vehicle and a looking at your Maxim kit to help improve the ride quality and wear on the vehicle.

    I am looking at the yellow -54 density as apposed to the black -47. I am happy with a firmer ride and am treating this as more of a commercial vehicle as it will be constantly loaded.

    Do you think the -54 density will be too much for my application?



    1. Post

      Hi Tom,

      Hope all is well! With suspension, bigger or heavier isn’t always better. Especially when referring to the Maxim kit. I recommend the -47, as we do want to keep ride quality in mind. For your particular application, go with the following part numbers:

      SSF-106-40 https://www.superspringsinternational.com/shop/SSF-106-40

      SSR-106-47-1 https://www.superspringsinternational.com/shop/SSR-106-47-1/

      The SSR-106-47-1 is rated at 4,600 lbs. at 50% compression, and can also compress all the way up to 80% of it’s original body height. Take a look at these parts, and let me know what you think!

  21. Hello. I have a 2019 Toyota Tundra TRD PRO which in mostly used when traveling, or hauling a 3-horse slant or 24′ car-hauler that carries everything from a classic car to round bales of hay; both are bumper pull. I will soon add a TRD rear sway bar to help with stability but I’d don’t expect that to do much for the sagging rear end. I’ve been considering airbags which I’ve had on previous vehicles, but I don’t really like having to worry about air pressure… I just this morning heard about your product so I’m curious about its comparability with the sway bar, the ability to support the rear vehicle sage, and the ride when not towing. Also, regardless of the trailer load, we always have three 100lb+ German Shepherds riding in the truck bed. Thanks, Gary

  22. Post

    Hey Gary,

    The SumoSprings aren’t quite as effective as a sway bar, as the primary function of the SumoSprings is to add capacity to the suspension of the vehicle. However, because of how they are designed, and the material they are manufactured from, they do reduce body and roll and improve overall handling. The SumoSprings Solo kit is the kit we offer for the Tundra, which is available in three different densities:

    -40 (Blue): light and medium duty
    -47 (Black): light, medium, and heavy duty
    -54 (Yellow): medium and heavy duty

    I do not recommend the -54 (Part number SSR-610-54), because your vehicle is not used for commercial purposes.
    If your truck is loaded most of the time and rarely unloaded or empty the -47 is most appropriate (SSR-610-47).
    If your truck is empty/unloaded most of the time, then the -40 is the one I recommend (SSR-610-40).

    SSR-610-40 – https://www.superspringsinternational.com/shop/SSR-610-40/
    SSR-610-47 – https://www.superspringsinternational.com/shop/SSR-610-47/

    Hope this helps, let me know if you have any questions!

  23. Hello,

    I have a 2014 Newmar Bay Star with a GVWR weight of 20,500 lbs on a F53 chassis with a 7500 lb front GAWR. Can you please recommend which Sumo Springs I should use on the front and rear. Thank you.

  24. Hello Joe,

    Thank you for contacting us. For your 2014 F-53 Newmar with a 20,500 GVWR we would recommend the SSF-170-40-2 for the front and the SSR-187-54-1 for the rear. Below are the links to product info and pricing. I’ve also included the instructions. Please note that on certain coaches there is a metal bar on the frame in the rear that will not allow for proper installation, please check the coach before ordering to make sure that there is nothing preventing proper installation. Please let me know if you have any questions.

    SSF-170-40-2: https://www.superspringsinternational.com/shop/SSF-170-40-2
    Instructions: https://www.superspringsinternational.com/instructions/INS_SSF-170-40-2.pdf

    SSR-187-54-1 :https://www.superspringsinternational.com/shop/SSR-187-54-1
    Instructions: https://www.superspringsinternational.com/instructions/INS_SSR-187-54-1.pdf

    Thank you,

    (805) 881-3820
    [email protected]

  25. Hello, I have a srw 99 f350 that I use as a work truck for granite countertops.I regularly carry 1500-3000lbs in the bed. About once or twice a month I can carry 4000lbs+ in the bed when I go to pick up slabs, sometimes the truck squats quite a bit. Also plan on getting a camper soon and those usually weight 3000-3500. Question is, should I get the rebel sumosprings 3000lb or 5000lb. Wondering if the 5000lb would make the ride a little rough when unloaded or going off road. Also I might add that I have rancho 9000xl shocks that can adjust the shock absorbers stiffness. Let me kno what you guys think

    1. Donovan,
      Thanks for reaching out. If you’re hauling 1500-3000 lbs regularly, then the SSR-101-40-2 could be a great option. If you’re only occasionally hauling close to 4K then you should be in good shape. The SSR-101-40-2 is rated at 3K at 50% compression so you can load it over 3k from time to time. I don’t think you’ll need more. If you do require additional support, we do offer a 30 day satisfaction guarantee. So, if you buy them directly from us, we can swap them out if you needed more support. the SSR-101-40-2 is also going to give you the smoothest unloaded ride quality. Please let me know if you have any further questions.

  26. I have a class B on a 2017 Mercedes Sprinter 3500 chassis 2 wheel drive. The GVWR is 11,050 lbs. Which sumo springs do you recommend? the 338-40(blue)/ 338-47(black)/ 338-554 (yellow)

    1. Gus,

      Thank you for reaching out to us, if you are going to be towing anything I would recommend the SSR-338-54. If you are not towing anything I would recommend using the SSR-338-47. For the front of the coach I would go with the SSF-106-40. Please let me know if there is anything else that I can help you with.

      Thank you,


  27. I have a 2014 Tundra CrewMax 4×4 5.7 L. I tow a TT approx 6400 lbs. The tongue is 700 lbs
    With 2 group 24 batteries & 2 20 lb propane tanks on the tongue. The truck squats almost 2 inches. With the
    Anderson WD hitch the rig is Drives well.
    I am well under GVWR. Which Sumo spring helpers should I select, 47 or 54?

    1. Post


      Thanks for all the info about your truck! Here is how I’d choose between the two:

      If your truck is ever empty, at any time, go with the SSR-610-47 . This is a lighter density with a bit less of a spring rate which would be good for an unloaded ride.

      If your truck is never empty, and always has this kind of weight applied, then go with the SSR-610-54 .

      SSR-610-47 – https://www.superspringsinternational.com/shop/SSR-610-47/

      SSR-610-54 – https://www.superspringsinternational.com/shop/SSR-610-54/

      Let me know if you have any questions!

  28. I have a 2020 RAM 1500 Crew Cab 4X4, 5.7 Hemi with 3.92 rear end, with Equilizer WD hitch and 28′ TT with approximate tongue weight of 775 lbs and pull it 12-14 times a year. Which pn and density, 40 or 47, would you recommend?

    1. Post

      Hey Gary,

      Thanks for the info, and for thinking of SumoSprings to help your truck! It really comes down to the old-fashioned “butt test!” However, here is how we usually recommend how to choose the density:

      If your truck is mostly unloaded, or lightly loaded, go with the blue (-40) density. If it is the other way around, and your truck is mostly loaded and rarely unloaded or lightly loaded up, go with the black (-47) density. There’s always an exception to the norm, but this is probably the best way to make the decision until you actually get the SumoSprings installed and get to try them out for yourself. Here are the part numbers:

      SSR-307-40 (blue) – https://www.superspringsinternational.com/shop/ssr-307-40/
      SSR-307-47 (black) – https://www.superspringsinternational.com/shop/ssr-307-47/

      Please let me know if you have any questions!

  29. I have a 2018 Ram Promaster converted camper van. Total weight 6500 # with the conversion (GWV 8900). When I travel, I may add another 600# to the vehicle. For best result for rear, which color 40, 47 or 54 do you recommend. I will not tow anything.
    Also do you recommend adding the front sumo springs?

    1. Post

      Hi Chen-Wei,

      Sounds like a fun project! Thanks for the information you’ve given, it really helps. The parts depend on which ProMaster you have, but typically the yellow SumoSprings (-54) are what are best for the rear. For the ProMaster 3500 in particular, here is what we recommend:

      CSS-1195 – https://www.superspringsinternational.com/shop/css-1195/ (click on link for more info)

      SSR-313-54 – https://www.superspringsinternational.com/shop/ssr-313-54/ (click on link for more info)

      Although the front kit is not 100% required to be installed at the same time as the rear, you will see much more of an improvement by upgrading all four corners, seeing as suspension is a holistic system where the front end works in conjunction with the rear end. Our team is in constant communication with ProMaster owners, and the overwhelming feedback points to going with both. If you actually have the 1500 or 2500, or have any questions at all, please let me know!

  30. I just purchased a used Tundra SR5 Double cab, my travel trailer is 7700 pounds fully loaded plus the gear in the truck and Kayaks on the top of the cap. i was leaning towards the black 1500 pound SumoSprings or should i go with the 1000 pounders. this truck is my tow pig and winter vehicle. if the black is a bit stiffer ride that is ok.
    Thoughts, is my logic flawed?


    1. Post

      Hey Jeff,

      Not flawed at all! We typically recommend the -40 (blue/1,000 lbs. density) for trucks that are empty or lightly loaded most of the time, and only occasionally loaded up with excessive weight.

      If your truck is generally loaded up and never really empty, the -47 (black/1,500 lbs. density) is the way to go. On an unloaded truck, it will be more firm; not harsh, but more firm.

  31. Hi- I have a 2018 Ford F250 4×4 diesel. My slide in camper weighs around 2200 lbs and the tongue weight of my boat w/trailer is around 300. Also have a travel trailer at 6500lbs with corresponding tongue weight. Truck has one of these load probably at least 50% of the time. Should I go with the black or blue? The slide in camper sage the rear about 3 inches. thanks

    1. Post

      Hi Scott,

      Thanks for the information, my name is Peter. I recommend the blue Rebel SumoSprings kit; part number SSR-128-40-2.

      Installation Instructions: https://www.superspringsinternational.com/instructions/INS_SSR-128-40-2.pdf

      This kit gives 3,000 lbs. capacity at 50% compression, while also providing a smooth, progressive ride quality while the truck is loaded and unloaded. Take a look and let me know what questions you have Scott.

  32. I’ve got an older Toyota Tundra (2nd gen) that use to haul loads in the bed and occasionally pull a utility trailer with. However, we dont want to deal with maintenance of pressure with airbags so considering sumosprings.

    Originally considered the Yellow -54 springs; but after reading reviews about ride quality and rebound on cars with worn shocks / leaf springs am considering -47 sumosprings (maybe even -40).

    Question: All of the ratings express capacity at 50% compression. What happens on the off chance the truck is loaded with more weight than the springs rating. Will the spring go to 75-80% compression? Will it ruin or crack the springs?

    1. Post

      Hi Andy,

      Your comments and questions are much appreciated! We’re glad you’re looking into the differences between the SumoSprings and a conventional airbag system. Unlike an airbag, SumoSprings are manufactured from a progressive micro-cellular urethane, which is able to compress, with full memory rebound. You pretty much hit the nail on the head with the maximum compression rate, as SumoSprings can compress all the way up to 80% of the original body height if need be. The more they compress, the more resistance they give so the capacity shown at 50% extends with the spring rate. When deciding between the -40 and -47, it’s really about frequency and your preference between more of a soft unloaded ride (-40), or a firm unloaded ride (-47). We typically recommend the -40 on a vehicle that is mostly unloaded/empty than loaded up. If your truck is usually the other way around and is loaded up more than unloaded, then the -47 would be better fitted for your suspension needs. Hope this helps!

  33. I have an tiffin 36la Motor home with GVW 24000 lbs. I would like to stop the roll, as well
    as the blow of passing large trucks etc..
    I am considering the Yellow for both the front and rear for my Coach.

    What are your Thoughts.

    1. Post

      Hello Roger,

      Thank you for reaching out. One of the primary functions of SumoSprings is to reduce the sway and body roll, so you’re in the right place! We actually only manufacture the blue density for the front end of the Class A motorhomes built on the F53 chassis. Can you please let me know the year of the chassis so I can help with the proper part numbers or both front and rear? Thank you!

  34. Hello,

    I have a 2020 Toyota Tacoma Off Road with 4 leaf springs. The truck will generally always have a 150 pound topper, 200 pounds of tools/gear and two crated 50 pound dogs. In addition, I would occasionally pull a single axle trailer with a 700 pound atv and 200 pounds of gear. Any recommendations for sumo springs?

    Thank you.

    1. Post
  35. I own a 2015 Ram 1500 quad cab 4×4 Bighorn. I have a travel trailer with a 740 pound hitch weight that I tow 6-10 times a year

    What spring would work best
    Thank you

    1. Hello Tim,

      Appreciate the information. With the travel trailer having a Hitch weight of 740 pounds we would recommend the SSR-307-40 rated at 1,000 (lb) Capacity at 50% compression.

      Here is the link to Part Number SSR-307-40: https://www.superspringsinternational.com/shop/ssr-307-40/

      It is made of our lightest duty material so when you have the vehicle unloaded you will have a smooth ride and once you load it up with the trailer or add weight to the inside of the bed of the truck it will still give support and help resist the weight. We want to make sure you are getting the Support you are looking for when loading up the truck but also keep your unloaded ride comfortable.

      Her is an installation video you can take a look at: https://youtu.be/uluA4YA0N9Q

      Let us know if anything else comes up!

      1. when using the springs in conjunction with a WD/Sway control hitch, am I correct in thinking that when I determine my Ball height, it shold be based on the height witht he truck loaded on sitting on the Sumo’s?


        1. Hi Tim,

          Thank you Tim. I’d recommend installing the SumoSprings first and then follow the standard instructions for setting up the hitch. Feel free to give us a call or let me know if you have any additional questions.

          Thank you,


  36. Getting ready to purchase and install Sumo’s on my 05 Ford excursion I’m towing a 27′ tow behind trailer dry weight 5000 lb dry what do you recommend?

    1. Post
        1. Post
  37. We have a 23 foot Nash travel trailer five years old. Leaf spring broke and the other leaf springs are in poor condition. We have two axle 3500 pound each. Wanted to increase capacity of the leaf springs but the next Available capacity was 5800 pounds per axle. I felt this would be too stiff so I purchased the standard leaf spring set replacing all four. I am Looking for something that would Softly limit the travel. Will your product help me? If so can you recommend Which product?

    Thank you

    1. Hello David,

      Thank you for your entry, our trailer SumoSprings will help out with this issue that you are facing. Are you leaf springs over or under on your axle? This will determine which is the correct product for you. Looking forward to your response.

      Thank you,

  38. I am hauling an approximately 7,000 lb Toy Hauler trailer with a 2019 Ram 1500 Classic. The dry tongue weight of the trailer is 890lbs. I use a weight-distribution hitch to help with sway and sag. I am looking at sumo springs to help with sag a little be and improve the ride while towing. I am not towing all the time, but I am wondering if I should get the 1,500 lb rated springs since my tongue weight is close to the 1,000 lb rating. I do not expect my tongue weight will not be reduced much by loading my rear garage because I am not hauling anything heavy in the back of my trailer.

    1. Post

      Hi Corey,

      Thank you for reaching out. Because of how often the weight on your Ram changes, I recommend to consider the SSR-307-40 (1,000 lbs. capacity at 50% compression). The SumoSprings can compress to about 80% of the original body height, in which case they’d continue to give capacity. The micro-cellular urethane the SumoSprings are manufactured from is a progressive material, which means the more compression they experience, the more resistance they give.

      The higher density SSR-307-47 (1,500 lbs.) is perfect for a vehicle that is constantly loaded, and only occasionally unloaded as it provides more of a “firm” feel to the unloaded ride quality.

      SSR-307-40: https://www.superspringsinternational.com/shop/ssr-307-40/

      SSR-307-47: https://www.superspringsinternational.com/application-guide/SSR-307-47

      Let me know what questions you have Corey.

  39. Good morning,
    I am trying to improve the ride on our 2000 Leisure Travel Van Class B RV. It is built by LTV on a Dodge Ram 3500 chassis. The current (original) bump stops are a long way from the axle and I doubt they are ever engaged.
    I am looking at the SSR-302-47 as replacements for the rear of the vehicle. Would these work.
    I can send a photo if that would help.

    Respectfully submitted,

  40. I have a 2019 Forest River Georgetown XL class A motorhome. Last year after our first white knuckle trip, I put a Roadmaster heavy auxiliary sway bar on the rear axle and the Sate-T-Plus sterling stabilizer on the front. The ride and handling were significantly improved but we still got some roll in wind and when a semi would pass. Sometimes it would still push us. Look to see if you think the SumoSprings would significantly help our ride. We tow a 2004 Jeep Wrangler behind our motorhome. Thanks for your help in advance.

    1. Post

      Hi Gary,

      SumoSprings are designed to help alleviate the symptoms you listed above. Because of their ability to dissipate road shock/vibration, and reduce the amount of sway, we believe the SumoSprings would make a noticeable difference for your motorhome. for help with the part numbers, please provide the GVWR (Gross Vehicle Weight Rating).

  41. Hi! I am considering Sumo Rebels for my 2015 F350 4×4 dually. It’s usually hauling a load, whether 1500 lbs of hay, or my large 4 horse LQ trailer with slideout – and I cringe when when the truck ‘squats’ about 3 inches when dropping the trailer down onto the gooseneck hitch. I’m looking to level the truck a bit and smooth the ride for my horses. Should I go with the SSR-139-47-2, or the SSR-139-40-2? Thanks!

    1. Hello Kathy, based off of the information I would recommend the SSR-139-40-2, the SumoSprings work with the current suspension that is on the truck, so not all of the weight will be resting solely on the SumoSprings, these will help with keeping the truck level, but also provide you with a smoother ride and greater stability of the trailer. Please let me know if you have any questions.

  42. 2013 ram 3500, crew cab, dually, diesel, long bed, 4×2 with optional 6K FGAWR (solid axle) all suspension parts and alignment specs are the same as 4×4 models including the jounce. installing 400lb front bumper should I get blue or yellow on front axle

    1. Post

      Hi Steven,

      We actually only offer the -47 (black) density for the front end of the 2013 Ram 3500 4×2. Part number SSF-301-47 is the only option confirmed and available for your particular truck. Since you are adding a heavy duty bumper however, this kit is the one that I’d recommend to replace/upgrade the factory bump stop. Please see the part via the link below, and let me know if you have any questions.

      SSF-301-47 https://www.superspringsinternational.com/application-guide/SSF-301-47

  43. I have a 2015 Tacoma OffRoad with tow capacity of 6200 lb. I usually keep less than 100 lb. of tools in the bed. We pull our 25’ 4500 lb. travel trailer once a month on trips. I’ve decided to add Sumo Springs rather than helper springs to help with a little sag I have even with my weight distribution hitch. Would you agree and would you recommend blue or black Sumo Springs?
    Thank you

    1. Post

      Hi Chris,

      If your truck is mostly unloaded, go with the blue (-40), as we want to keep your unloaded ride quality in tact as much as possible.

      If your truck is mostly loaded up, go with the black (-47), as the higher density works better while constantly engaged.

      The black kit will not ruin the unloaded ride, but it will definitely provide and more “firm” feel, rather than a softer one while empty.

  44. I have a 2004 Ford F250 Superduty 4×4 Long Bed Truck that we tow about once a month or once every month a 5th wheel that weighs about 10,000 lbs. We do have some sag when towing the trailer and want to reduce this as well as be more comfortable ride. What Sumospring would be the best for this? The SSR-140-54 or the SSR-140-47 or another?

    1. Hi Susan,

      What is the pin weight?

      The SSR-140-47 is rated at 1500 lbs at 50% compression.
      The SSR-140-54 is rated at 2800 lbs at 50% compression.

      Although both the -47 and -54 are the same height, if the springs were to engage when unloaded the -54 will be much more firm than the -47. If you live in an area where there are a lot of bumpy /uneven roads, I’d recommend going with the -47 as you mentioned being concerned about your ride comfort. If reducing the squat when hauling is more important, then I would go with the 54.

  45. I have a 2020 Ford F250. I have a 2.5″ leveling kit on the front and stock in the rear. I occasionally tow a 32′ travel trailer loaded weight about 8k with a 1k tongue weight. I am utilizing a equalizer 4pt wdh. I am looking to alleviate some of the rear sag. Would the black 47 or yellow 54 be optimal for my setup. Thanks in advance.

    1. Post

      Hi Kevin,

      Thanks for reaching out! We’d really only recommend the -54 (yellow) density on a commercial vehicle where ride quality is not an issue because the truck is never unloaded or, a heavy motorhome with excessive weight applied at all times.

      That being said, the -47 (black) does provide a firm feel to the truck while unloaded but is much less of a spring rate to help with the ride quality. Feel free to give me a call if you have any questions – Peter (805) 881-5205.

      Thank you!

  46. Hi,
    I am acquiring a 2019 Ram Promaster 1500 (139 WB) that has been converted into a campervan and am unsure which version of Sumo Springs would be most appropriate for the rear wheels. We will be carrying the usual array of camping gear (nothing especially heavy) and not towing anything. I don’t know what the conversion added to the weight of the van, but it was a simple conversion (e.g., no water tanks, just two jugs) so probably a minimal weight add-on. Would you recommend the blue 40s, black 47s, or yellow 54s?

    1. Hey there Brent, thank you for contacting us. Based off of the weight capacity and the type of conversion that you have, I would recommend the CSS-1168 for the front, and the SSR-313-40 for the rear. This is based off of the 1500 and that the conversion was very minimalist. Please let me know if you have any questions.
      Front: https://www.superspringsinternational.com/application-guide/CSS-1168
      Rear: https://www.superspringsinternational.com/application-guide/SSR-313-40

  47. Thanks for creating such a great product and being quick to respond to our questions. Great service.

    I’m currently using Super Springs SSA43 on my 2015 Ford Transit T350HD Cutaway w/ Unicell Aerocell fiberglass box as a DIY camper van conversion and weigh about 10,000#.

    The van will be under heavy load 100% of the time as it is our full-time live in creation.

    Would you recommend adding Sumo Springs to the Super Springs that are about to be installed this week, if so, which Sumo Springs?

    Additionally, do you provide a solution for the front suspension you’d recommend?

    Thanks in advance!


    1. Post

      Hi Samuel,

      Thank you fro using SuperSprings and for asking about SumoSprings! Although the combination of SuperSprings and SumoSprings is a rare one on the transit, it is definitely a possibility if you are looking for additional load support and carrying capacity. I’d recommend a lighter density, and to potentially eliminate the use of any spacers since the SSA43 has more than likely lifted the application up some.

      Take a look at this kit here:

      SSR-121-47: https://www.superspringsinternational.com/shop/ssr-121-47/

      This is the mid-density (black), and would add 1,500 lbs. of carrying capacity. Please let me know if you have any questions!

  48. We have a 2021 Thor Challenger with the v8 7.3 engine on the F53 chassis with MoRyde suspension and it is rated 24,000 gvw.
    We are looking into the sumo springs. What do you recommend? Yellow in front blue in back? Or blue all around?
    I know the Sumo springs are phenomenal on the old chassis. Have there been issues in the new one? I have also heard there are new brackets that must be used? We have heard from 2 people that the Sumo made their ride hard and they felt they were being held in the seat by their seatbelt but yet a few more say that are great? I am very confused.
    Thank you for your help.

    1. Post

      Hi Laura,

      Thanks for checking in with us. We actually do not research to definitively say whether or not the SumoSprings will work in conjunction with the MORryde system on the Ford F53 chassis. It could be a matter of placement for both products, as they both attach to some point of the leaf pack, but could also be a matter of how each product affects the performance of one another.

  49. hi guys, I have a 2015 Ram 3500 Cab and Chassis truck with a heavy Homemade flatbed, because of this, the truck sits leveled and I’m happy with that, my problem is in the front, I have a solid front axle and each time I go over a speed bump I can literally feel the bump stops reaching limit, and that’s such an awful feeling, specially when I have 10 of those in my daily commute to work, do you guys think that the front sumosprings would solve this? is worth mentioning that I have stock suspension, 35 tires and as I said before, because of my heavy flatbed, I sit leveled.

    Also, would adding some blue sumosprings to the back make the truck ride smoother?

  50. Post

    Hi Yasin,

    Yes, adding SumoSprings would help dampen road shock and vibration to both the front and the rear. If you are simply looking for a better ride quality, the blue kits would be the most recommended options!

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