If you're looking for a heavy duty helper spring that can provide up to 5,000lbs of leveling capacity, the Air Lift 88297 Loadlifter 5000 Ultimate Helper Spring Kit is the perfect choice. Featuring built-in internal jounce bumper and air adjustable from 0 to 100 PSI, this helper spring kit also includes roll plates to protect the air springs. Quick connecting and easy-to-use air fittings make installation a breeze, and the heavy duty construction means this helper spring will stand up to whatever you throw at it. Fits dual (DRW) and single rear wheel (SRW) models without a fifth-wheel hitch.