Air Lift LoadLifter 7500 XL Air Springs w/ WirelessONE Compressor Kit for F-350. LoadLifter 7500 XL Ultimate Air Spring Kit and WirelessONE Air Compressor System for Ford F-350 Super Duty. LoadLifter 7500 XL Ultimate Air Spring Kit. The LoadLifter 7500 XL Ultimate offers up to 7,500 lbs. Of load-leveling capacity, designed to support the most demanding loads. With the 7500 XL, level the load with less pressure and better ride quality. Get full-time support while you level your vehicle, improve braking and ride comfort, and reduce the strain on factory suspension. Up to 7,500 lbs. Eliminates squat, trailer sway, rough ride and bottoming out. Fits many 3/4 ton and 1 ton pickups and vans. Internal jounce bumper absorbs shock and can be safely ran with zero psi. Application Type: Rear Kit. Replacement Air Spring: 50236. Does not fit commercial chassis. Fits Dual Rear Models only. WirelessOne is a single-path, wireless control system including a standard-duty compressor. Air springs are controlled with the wireless controller or a compatible smartphone, and our free app is programmable with up to three user-defined presets. Single-path control: Left and right air springs are inflated/deflated equally. Wireless handheld unit and NEW mobile app for convenient operation inside or outside the vehicle. Easy installation – no air lines to the cab! Three programmable, user-defined memory settings.