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Bumpy pavement and uneven roads can make towing a chore. These SumoSprings Trailer Helper Springs w/ Line Relocation Bracket use a patented micro-cellular urethane material that compresses up to 65%–80% of its original height and rebounds fully. The progressive spring rate lets the suspension move freely on light loads while firming up as weight increases. The result is a smooth, comfortable tow that absorbs vibration and keeps the trailer stable over rough surfaces.
When the trailer is loaded down, control and stability matter most. Each spring provides 900 lbs of support at 50% compression, giving the suspension the extra help it needs for 5,000- to 8,000-lb single underslung axles. The added stiffness reduces sway, limits body roll in corners, and helps the trailer track straight even when wind or passing traffic pushes against it.
Adding support shouldn’t mean tearing the trailer apart. The kit includes two jounce-style springs, a line relocation bracket, mounting brackets, and hardware for a clean, bolt-on fit—no drilling required. It’s designed for 1-3/4" wide spring packs with 7-7/16" to 8-5/8" of clearance between the spring plate and frame, so it mounts up easily to a suspension that’s already in good shape.
Once installed, these springs just work. There’s no tubing to run or air pressure to monitor like with air bags. The closed-cell urethane won’t leak or rupture and delivers full memory rebound every time. That means less wear on the leaf springs, longer suspension life, and a consistent ride without extra upkeep.
Off-center loads or uneven terrain can make one side sag more than the other. Each SumoSpring works independently to balance out the trailer, helping maintain level stance and steady handling. The design also reduces the load on the leaf spring assembly and can slightly raise ride height for better ground clearance—all while keeping the trailer composed and predictable on the road.
Customer Satisfaction Score:
85% were satisfied with this product
15% of customers were not satisfied
Ratings & Reviews
Rich
4/5/2024
They worked as advertised.
Sierra K.
9/21/2021
It sounds like you may need longer ubolts. The ubolts labeled “H” in the instructions.
Paul J.
9/24/2023
Been a year, just fine so far :
Nick S.
11/10/2025
I am glad to hear the install went smoothly for you. Do you have any trips planned coming up?
Kate F.
11/26/2025
It really is AMAZING the difference these make Jake! Where did you go on your first trip with them? Or better yet, what has been your favorite campground of all time?
James H.
6/17/2025
After a year and a few thousand miles, the SumoSprings are still performing great on our Pup. I couldnt be more pleased.
Glenn E.
8/4/2022
One year later, no problems. Everything has worked well. The RV is more stable on the road. Great product, I would buy again without hesitation.
Diesel S.
4/13/2023
Overall its a good product! There is certainly only so much you can do with a single axle trailer, its going to be a rough ride. But the Sumo Springs definitely smooth it out. We have had significantly less damaged items in the trailer after installing them.
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Kate F.
9/14/2026
Thanks for the feedback, Jon! Glad the SumoSprings are doing their job, and we appreciate you pointing out the U-bolt issue.... I will be passing this along =)