Airmaxxx Air Assist Rear Load Leveler Kit. Kit Includes: 2 – Standard 2500lb Air Springs Mounting Brackets With Hardware 1/4 D. Approved Air Line With Fittings And Schrader Valve. Light drilling, cutting and/or welding will be necessary on some vehicles Professional Install Is Recommended. 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. Want to upgrade your kit? Adds compressor and/or tank with control from inside your cab.