Air Lift SuperDuty kits are our heaviest-rated kits for hauling or towing heavy loads. They're engineered and built with reinforced rubber bellows and end caps made of ultra high strength Zytel(r) nylon strong as steel, but it weighs less and is corrosion proof. It's all held together with our exclusive Shur-Grip crimp for lasting strength. * Fits many ¾ ton and one ton pickups, vans and motorhomes with leaf springs * Up to 5,000 pounds of leveling capacity * Air adjustable from 5 to 100 psi