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Heavy gear in the back can make your ride sag and throw off steering, traction, and braking. These SumoSprings Solo Custom Helper Springs add up to 1,800 lbs of support at 50-percent compression so your ride stays level and stable when towing or hauling. They help your factory suspension handle the extra weight, keeping your vehicle balanced and your handling predictable even under load.
Rough roads and uneven loads don’t need to mean a rough ride. The microcellular urethane material cushions bumps and shocks while reacting progressively to weight. With lighter loads, the springs compress easily for a softer feel; with heavier loads, they compress by as much as 80 percent to stay firm and supportive. That progressive rate keeps your ride comfortable whether you’re running light or fully loaded.
When a curve or crosswind pushes your vehicle around, these helper springs work independently on each side to keep things steady. They balance off-center loads and reduce body roll during sharp turns so your vehicle feels planted through corners and uneven terrain. The result is steadier handling and a more controlled drive when towing or carrying heavy gear.
These one-piece springs are made from tough microcellular urethane that resists oil, salt, abrasion, and UV damage. They perform in temperatures from -25°F to 200°F without cracking or deforming. Since they don’t rely on air pressure or tubing, there’s nothing to leak or maintain—just reliable suspension support every trip.
Getting better load support doesn’t have to be complicated. These custom helper springs bolt up easily with no drilling required. Once installed, they’re always ready to go—no compressors, airlines, or adjustments needed—so you can spend less time setting up and more time driving with a level, stable ride.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
Victor
9/2/2023
I pull a 19 foot ranger boat behind my 4runner and your Sumo Springs allow my 4runner to stay level and to handle safely. A must buy!
Jason
12/15/2023
Solid performance from the SumoSprings! Greatly assist when towing and keeping from having too much sag and a harsh ride. Perform great off-road and allows bumps and hits to soak up nicely without a hard noticeable hit.
Scott
7/24/2024
Working out Great!! Love them.
Vinnie
6/27/2024
Excellent product, driving characteristics are much better then factory had them set... Love them, would buy again for another vehicle
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Frank
10/29/2024
Still very happy with my Sumo Springs. Will most likely put a set on my new 2022 4Runner in the Spring. The year old set on my 2019 4Runner still reduces sag when the 3200 trailer is connected, and there is a clear improvement in tightness and perceived stability when compared to the newer stock 2022 4Runner. Good investment.