Upgrade your trailer with SuperSprings Trailer SumoSprings, a maintenance-free suspension enhancement that creates a better towing experience! Each SumoSpring is handcrafted with care, boasting unique natural characteristics like subtle color variations and surface bubbles that showcase the craftsmanship behind every piece. Designed to reduce G-force in your towable by 68%, these microcellular polyurethane springs remove sway, hop, and body roll, while increasing overall driver control and comfort. The TSS-106-47 model is engineered for trailer frames with a GAWR of 5,000-8,000 lbs, with the spring sitting underneath the axle tube. To maintain full memory rebound, the Black SumoSprings should not be compressed past 65% of their original height. | Note: This product is designed to work on most trailers with the springs mounted below the axle. Will not work on spring plates wider than 4.25". Because of the varying build designs from different trailer manufacturers, there are occasionally some models that this product will not fit. For installation of Trailer SumoSprings the gap between the top of leaf spring and bottom of the frame must be between 6″ and 8.65″.