AIR LIFT 57215 LoadLifter 5000 Series Rear Air Spring Kit Fully adjustable air springs level your vehicle when towing or hauling a heavy load for a safe comfortable ride Eliminate sag and bottoming out and when all four tires are firmly on the ground, braking time and steering are both improved Rugged durable components including air springs and all hardware Easy to install with included instructions Up to 5000 pounds of leveling capacity