SuperSprings Trailer SumoSprings are a maintenance-free suspension enhancement built to create a better journey by reducing G-force in your towable by 68%. Handmade from micro-cellular polyurethane, they are designed to remove sway, hop, and body roll while increasing overall driver control and comfort while towing. The TSS-107-40 SumoSprings are designed for trailer frames with a GAWR of 3, 000-5, 000 lbs. with the spring sitting on top of the axle tube. The Blue SumoSprings shouldn't be compressed past 70% of their original height in order to keep full memory rebound. NOTESThis product is designed to work on most trailers with the springs mounted above the axle. The factory spring plate must not be wider than 4-1/4". 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 the spring plate and bottom of the frame must be between 5.3" and 6.55".SuperSprings International products are specifically designed for vehicles equipped with factory suspension. Compatibility cannot be guaranteed with aftermarket products or parts. SpecificationsWeight: 13 lbs. Dimensions: 13.5" x 8.25" x 4.25"Spring Diameter: 3"Spring Height: 4"Capacity: 1, 400 lbs. at 50% compression Designed to remove sway, hop, and body roll For trailer frames with a GAWR of 3, 000-5, 000 lbs. TSS-107-40 fits trailer frames with the springs sitting on top of the axle tube | SuperSprings TSS-107-40 Trailer SumoSprings, 3,000-5,000 lbs in Blue