57291 LoadLifter 5000; Leaf Spring Leveling Kit; Rear; Installation Time - 2 Hours Or Less;Up to 5000 lbs. of Leveling Capacity. Uses 2-Ply Fabric Reinforced Air Springs. Air Adjustable from 5 to 100 psi. Quick Connect Easy-To-Use Polymer Air Fittings. Reinforced Air Bellows For Long Lasting Strength. Vehicle Specific Illustrated Installation Manuals. Limited Lifetime Warranty.