Important Notes: This product may not fit all trailer models due to the varying build designs from different manufacturers; For installation the gap between the top of spring plate and bottom of the frame must be between 5.3 inches and 6.55 inches Maintenance Free Suspension Enhancement: Trailer SumoSprings are a maintenance-free suspension enhancement built to create a better journey by reducing G-force in your towable by 68% Increases Overall Driver Control: Crafted from microcellular polyurethane, these SumoSprings are designed to remove sway, hop, and body roll while increasing overall driver control and comfort while towing Specifically Designed: This product is designed for trailer frames with a GAWR of 3,000-5,000 lbs with the springs mounted above the axle; The factory spring plate must not be wider than 4-1/4 inches Buy with Confidence: The Trailer SumoSprings are backed with a limited lifetime warranty against defects in material and workmanship