$249.99Ships within 1 week

Trailer SumoSprings are a maintenance-free suspension enhancement built to create a better journey by reducing G-force in your towable by 68%.  Handmade from micro-cellular polyurethane, they are designed to remove sway, hop, & body roll while increasing overall driver control and comfort while towing.

 The TSS-107-40 is designed for trailer frames with a GAWR of 3,000-5,000 lbs with the spring sitting on top of the axle tube. The blue SumoSprings shouldn’t be compressed past 70% of their original height in order to keep full memory rebound.

This product is designed to work on most trailers with the springs mounted above the axle.  The factory spring plate must not be wider than 4-1/4″.  Because of the varying build designs from different trailer manufacturers, there are occasionally some models that this product will not fit. For installation of Trailer SumoSprings the gap between the top of spring plate and bottom of the frame must be between 5.3″ and 6.55″.

John Frieden
2023-05-30 09:13:19

Excellent order processing. My order was shipped much sooner than estimated ship time when I placed the order. Just completed an 800 mile round trip with my new SumoSprings installed on my trailer. The improvement in ride and towing experience is remarkable. This is the best modification to my trailer yet. If I buy another trailer SumoSprings will be the first thing I install.

Brett Larsen
2023-05-30 09:11:38

Preformed we’ll above my expectations

steve robin
2023-05-23 09:21:52

Made HUGE difference while towing

Douglas Olsen
2023-05-23 09:20:43

Installation was pretty easy. I had to add the offset plates on our rig. I had a problem with the self-tapping screws that came with the plates. I had two strip out and gave up on using them to secure the plates with. I ended up replacing all of the self-tapping screws with 3/8” Grade 8 bolts with self locking nuts.

Bill Sheremeta
2023-05-16 09:30:00

Very easy to install, only ran rv to get inspection but could tell rv ( 5th wheel ) wasn't bouncing on bad roads

Lester Newsom
2023-05-02 09:49:53

Great and prompt responses from SuperSprings! I did the install at the same time I was upgrading the equalizer with wet bolts and the CRE3000. The SumoSprings were super easy to install and I relocated the gas line with the supplied kit and fabbed up my own brackets to account for the frame/spring offset, only because there was no time to order before our first trip. These seem to have solved our issue with things in the camper being tossed about! We did a 560 mile round trip and the trailer handled amazingly better!

John M
2023-03-27 12:55:45

Rarely have I had a product greatly exceed my expectations, but I was blown away by the difference these made on my travel trailer. Virtually eliminates sway and bounce over bridges. Highly recommend.

Chris Sedlak
2023-03-14 09:32:50

Super easy to install. I can already feel the difference.

2023-03-09 06:15:12

I wanted to update what I said above about my 2021 JayFeather with offset leaf springs and frame. Super springs reached out and provided me with a solution with the adaptor plate. It’s been working very well for almost 2 years now. Great customer service!!

David Alari
2023-03-08 09:25:21

They Springs really stabilized the front of the vehicle. They were super easy to install and the installation instructions were right on the money.

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Customer Reviews

19 ratings for the TSS-107-40
4.84 out of 5

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Product Specifications

Weight 13 lbs
Dimensions 13.5 × 8.25 × 4.25 in
Spring Diameter


Spring Height



1400 (lb) Capacity at 50% Compression