Air Assist Load Leveler Kit For Heavy Hauling. 2 – Standard 2500 lb Air Springs. Mounting Brackets With Hardware. Approved Air Line With Fittings And Schrader Valve. Provides Up To 5000lbs Of Leveling Capacity. Easily Add Or Remove Air Same As You Would A Tire. Never exceed more than truck manufacturers. Professional Install Is Recommended. Cutting & Drilling Is Required For Install.