![Image](https://www.superspringsinternational.com/wp-content/uploads/Outback_Kitters_Stacked_-_Black.png)
Outback Kitters is Australia's premium manufacturer, distributor and retailer for products designed specifically for overlanding and touring the harshest terrains.
![SumoSprings Compression Progressive Spring Rate Curve](https://www.superspringsinternational.com/wp-content/uploads/SumoSpring-Compression-GIF.gif)
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![Image](https://www.superspringsinternational.com/wp-content/uploads/springover-config.jpg)
SPRING-OVER AXLE CONFIGURATION
This zero-maintenance airbag alternative increases overall driver control and ride comfort when towing.
If your towable has axles with a weight rating of 3-5,000lbs, you'll need the blue (-40) Trailer SumoSpring. Anything 5,000lbs or greater, you'll want to go with the black (-47) SumoSprings option.
![Image](https://www.superspringsinternational.com/wp-content/uploads/springunder-config.jpg)
SPRING-UNDER AXLE CONFIGURATION
![](https://www.superspringsinternational.com/wp-content/uploads/Trailer-SumoSprings-1.png)
![Image](https://www.superspringsinternational.com/wp-content/uploads/TSS-Test-Data-Navistar-03.png)
![Image](https://www.superspringsinternational.com/wp-content/uploads/TSS-Test-Data-Navistar-05.png)
![Image](https://www.superspringsinternational.com/wp-content/uploads/TSS-Test-Data-Navistar-04.png)
Download the printable Coil Gap Tool here.