If you're looking for a heavy-duty helper spring kit that can handle up to 5,000 lbs. of load-leveling capacity, the Air Lift 88231 LoadLifter 5000 Ultimate Helper Spring Kit is the perfect choice. This kit comes with everything you need for a quick and easy installation, including all necessary mounting hardware and instructions. The air springs are adjustable from 5 to 100 PSI and feature built-in internal jounce bumper for a smooth ride. The durable 2 ply fabric construction ensures maximum strength, while the included nylon air line with quick connect air fittings make inflation easy. Plus, the black powder coated steel roll plates help protect the air springs from road debris.