LoadLifter 5000 ULTIMATE Heavy Half-Ton adjustable air spring kits feature all of the benefits of our heaviest rated air spring with the addition of an internal jounce bumper inside the spring for the ultimate in ride comfort. An Air Lift exclusive product! Fits vehicles with in-bed hitches. Tow and haul the heaviest loads with safety and comfort with LoadLifter 5000 ULTIMATE Heavy Half-Ton adjustable air spring kits. Works with vehicle's leaf springs to provide your half-ton exceptional rear load leveling capacity and keeps the vehicle riding stable level and comfortable whether loaded or unloaded. Fully adjustable from 5 to 100 PSI. The closed-cell urethane foam jounce bumper inside the ULTIMATE Heavy Half-Ton adjustable air springs provide a cushion of air that absorbs shock eliminates harsh jarring on rough roads and protects vehicles carrying heavy loads. Never bottom out again with the ULTIMATE! LoadLifter 5000 ULTIMATE Heavy Half-Ton adjustable air springs are maintenance free! Safely run with zero air pressure because of the internal jounce bumper. Replaces factory jounce bumper that is sometimes removed when adding air springs.