Suspension Load Leveling Kit. LoadLifter 5000 Leveling Kit. LoadLifter 5000 Leveling Kit; Rear; Installation Time – 2 Hours Or Less. WARNING CA Proposition 65: Yes. Fully Adjustable; Level Vehicles When Towing/Hauling. Eliminate Sag And Bottoming Out. Rugged Durable Components Incl. Easy To Install With Included Instructions. Up to 5000 lbs. Uses 2-Ply Fabric Reinforced Air Springs.