Air Assist Load Leveler Kit For Heavy Hauling. Kit Includes: 2 – Standard 2500 lb Air Springs Mounting Brackets With Hardware 1/4 D. 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 maximum load recommendations. Professional Install Is Recommended Cutting & Drilling Is Required For Install.