The LoadLifter 7500 XL Ultimate offers support for the heaviest tows with an internal jounce bumper absorbing shock for the smoothest ride. Air Lift’s fully adjustable industry-leading air springs are the perfect upgrade for your vehicle eliminating any issues you might face when towing and hauling. Tow and haul stress-free with Air Lift’s LoadLifter 7500 XL Ultimate. Designed with an internal jounce bumper for select Chevy Silverado/GMC Sierra 2500HD and 3500HD two-wheel and four-wheel drive this air spring kit eliminates frequent issues you might face like bottoming out squat and trailer sway. Air Lift’s air springs are fully adjustable and the jounce bumper allows you to tow and haul with lower pressures with 7500 lbs. of load-leveling capacity. The closed-cell urethane foam jounce bumper inside the air spring provides a cushion of air that absorbs shock eliminates harsh jarring on rough roads and protects vehicles carrying heavy loads. An Air Lift exclusive the kit features upper and lower roll plates for added protection. All end caps are made with an ultra-high-strength nylon composite formula strong as steel but much lighter and corrosion-proof. The air springs are built like tires reinforced with 2-ply fabric for maximum strength. With the added stability that air springs provide you can haul safely knowing that you have optimal braking and steering control. The LoadLifter 7500 XL Ultimate’s air springs are maintenance-free can run safely on zero air pressure and are fully adjustable from 5-100 PSI for precise control. Do not exceed the vehicle's gross vehicle weight rating (GVWR).