SuperSprings TSS-107-47 Trailer SumoSprings | 4-Pack | Made in the USA — Open-Box, 15% Off

Progressive Load Isolation: Specifically engineered for overslung trailer configurations with a 5,000 to 8,500-pound Gross Axle Weight Rating (GAWR), 1800 Lbs capacity

Smoother Towing Control: Minimizes trailer bounce and reduces sudden G-forces by up to 68% for a stable towing experience

Proactive Damage Protection: Dampens harsh road vibrations to significantly reduce continuous wear on trailer frames, cabinets, and electronics

Straightforward Complete Kit: Includes both left and right helper springs plus all necessary mounting hardware for an easy bolt-on installation

Built to Last: Weather-resistant polyurethane resists UV, moisture, corrosion, and extreme temperatures - backed by a limited lifetime warranty

The SuperSprings TSS-107-47 Trailer SumoSprings are handcrafted suspension helper springs designed to dramatically improve towing control and ride comfort. Built specifically for trailers with a Gross Axle Weight Rating (GAWR) between 5000 and 8500 pounds, this kit is tailored for overslung configurations where the leaf spring assembly sits on top of the axle tube. By creating a progressive cushion between the trailer frame and the axle, these helper springs absorb road shock, minimize violent bounces, and reduce G-forces by up to 68 percent. This premium suspension upgrade directly tackles common towing hazards by mitigating dangerous sway, body roll, and wheel hop during transport. This added stability not only boosts driver confidence in windy conditions or on uneven roads but also protects your investments. The reduction in continuous vibration translates to significantly less wear and tear on your towable RV or trailer components, including body frames, windows, doors, cabinets, and mounted televisions, lower overall maintenance costs over time. Manufactured from a proprietary closed micro-cellular polyurethane, these helper springs feature integrated air pockets that compress progressively under load. Unlike traditional air bags, they operate permanently without the need for air lines, compressors, or manual adjustments, ensuring a completely leak-proof and maintenance-free design that will not rupture. Each spring is built to retain full memory rebound and should not be compressed past 65 percent of its original height to maintain long-term performance. This complete rear kit includes a left and right pair along with all necessary mounting hardware for a straightforward installation that mounts directly above your leaf springs. Please verify that your factory spring plate width does not exceed 4.25 inches and that the clearance between the top of the spring plate and the bottom of the trailer frame measures between 5.3 and 6.55 inches for proper fitment.