Heavy Duty Springs: The LoadLifter 5000 Ultimate fits 2011 - 2019 Silverado/Sierra 2500 HD or 3500 HD and can haul the big stuff with up to 5,000 lbs. of load-leveling capacity, right up to the manufacturer's recommended GVWR, and are air adjustable from 5 to 100 PSI Safety and Comfort: Increase your safety and comfort when towing and hauling heavy loads with Air Lift air springs while the internal jounce bumper in the LoadLifter 5000 Ultimate prevents damage when driving with an empty air bag Single-Path Control: WirelessOne is a single-path system, meaning both air springs will be inflated or deflated to the same pressure; this is ideal for vehicles carrying loads that are equally distributed left-to-right Easy to Install: LoadLifter 5000 Ultimate includes internal jounce bumper, 2 air springs, all necessary mounting brackets, and hardware with a fully-illustrated installation guide; WirelessOne with EZ Mount includes everything you need for an easy install No-Risk Ride Satisfaction: LoadLifter 5000 Ultimate comes with a limited lifetime warranty with no mileage restriction; WirelessOne is covered by Air Lift’s 2-year compressor system warranty; 60-day Ride Satisfaction Guarantee on all load support systems All the goodies of the LoadLifter 5000 air spring kit with an internal jounce bumper inside - giving you the ultimate in lift, ride comfort, and safety. Air Lift’s internal jounce bumper helps to absorb shock, even with zero air pressure. What more could you ask for? Eliminates harsh jarring on rough roads. Maintenance-free! Safely run with zero air pressure. Replaces factory jounce bumper and provides three-stage ride comfort. Up to 5,000 lbs. of load leveling greatness.* Air Lift air springs beef up your existing suspension to boost your safety and comfort when hauling massive loads. WirelessOne is designed to work with most brands and styles of air springs, including those from Air Lift Company and other manufacturers. This makes it an excellent choice for those who already have an air spring system installed or those looking to upgrade their existing system. WirelessOne is a single-path system, meaning both air springs will be inflated or deflated to the same pressure. This is ideal for vehicles carrying loads that are equally distributed left-to-right. The controller and app are both programmable with user-defined presets, so WirelessOne can remember your frequently used pressures. The redesigned WirelessOne system is easier to install than ever, with a standard-duty air compressor and a small manifold. There’s no running air line inside the cab or fiddling with fuses, just a simple battery hook-up. Three programmable user-defined memory settings. The WirelessOne product line includes the EZ Mount pre-assembled bracket and compressor, which reduces installation times by up to an hour, making it quick and easy to get your air lift system up and running. Vehicle Compatibility: Fits 2011-2019 Silverado 2500 HD 3500 HD & 2011-2019 Sierra 2500 HD 3500 HD - IMPORTANT Fitment info: Does not fit cab & chassis applications. *Never exceed manufacturer’s recommended Gross Vehicle Weight Rating.