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When you’ve got weight behind you—a trailer, hitch rack, or a bed full of gear—rear sag can throw off your steering and braking. These Coil SumoSprings slide right between the coils on your rear suspension to help support that extra load. The microcellular polyurethane foam inside each insert cushions and stiffens progressively as weight increases, keeping your ride level and the handling predictable. You get the load support you need without changing your vehicle’s weight-carrying capacity or exceeding manufacturer limits.
Every bump, dip, or washboard stretch gets absorbed by these wedge-shaped inserts. Their inner core of microcellular polyurethane foam compresses gradually, soaking up road shock when loaded down and easing up when running light. That means less bounce, less rear-end sway, and a more comfortable ride whether you’re towing to the campsite or heading home empty.
Unlike air bags that need hoses, fittings, and pressure checks, these Coil SumoSprings require no air lines or upkeep. Just jack up the rear end so the coils extend, then slip each spring between the loops. Once installed, they stay put with no adjustments needed. You’ll have solid load support in place without worrying about leaks or monitoring PSI.
These helper springs are made to last through seasons of towing and hauling. The dense microcellular polyurethane resists abrasion, oil, road salt, and UV rays. It stays flexible through extreme temperatures and keeps performing trip after trip. With a 3" overall height and a 1-3/4" inside groove height that trims to fit your coil diameter, they’re ready for long-term use with zero maintenance required.
By adding cushion between each coil, these inserts help reduce body roll and keep your truck level when weight shifts or when road conditions get unpredictable. Steering feels more consistent, braking stays even, and your suspension doesn’t bottom out under heavy loads—all thanks to a set of helper springs that quietly handle the hard work underneath.
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
Ratings & Reviews
Michael
4/8/2026
Still working like new!
Michael T.
8/15/2015
There still seems to be less squat with my camping trailer attached. It is leveled out a bit.
Thomas
9/20/2021
Excellent product. Holding up great. When towing my camper, the squat is less the 1. Much better then before when 3 was the norm.
Brooke M.
3/19/2025
Awesome! Sounds like they are performing exactly how they are designed to - love to see it! When's the next trip with the boat?
Carleton
4/12/2025
Its been a year and they are still working fine. I hear the occasional thump, but they have definitely helped and are worth the money.
Charles
7/4/2025
They work great. Also added the Helwig rear stabilizer bar and Bilsteins 5100s to the rear. Tows the heavy boat nicely.
Kate F.
7/7/2025
James A.
4/10/2014
Hello Patrick, I still thing the springs are great. They seem to still function today the same as they did a year ago. The only thing I had to do to the was install better and more zip ties on the springs than what came with them in the box, to better hold them in their proper position.Thanks for the follow up.
Chad
9/16/2024
After a year of use and thousands of miles towing with these helper springs, they are still working great.
Joe O.
1/27/2022
The Sumo Springs were a little challenging to install on my Honda fit but was able to get them installed. The Sumo Springs were installed in conjunction with the Draw-tite hitch and Swagman bike rack to level out rear of car with to ebikes installed. The sumo springs handles the roll and pitch during lane changes and turns.
Brooke M.
7/9/2025
I am sorry to hear that! I haven't ever come across these sliding out of position before...What vehicle do you have these on?
A. F.
9/1/2019
Excellent! Working as advertised all this time. Thx you.
Bishop
6/22/2023
Weve towed a 30 travel trailer about 5k miles since the purchase. The tongue weight is 650-700 lbs. They allow a bit more squat compared with the Sumo Springs I put on my F150, but theyre definitely better than nothing, especially when paired with a weight distribution hitch. Unlike the ones I put on my F150, though, these dont seem to affect vehicle ride quality when the car is unloaded. Overall, Im happy with them and would buy them again.
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Brooke M.
4/8/2025
Wow, I can totally see the difference! I am so happy to hear these took care of business. Thanks for sharing your install hacks, too!