BOSS Air Bag Suspension Load Assist Kit – Great for towing & hauling heavy loads Fits: 2010 to 2020 Mercedes 3500 Sprinter Cargo Van & Cab Chassis + Dually – Models with 4 Rear Axle ONLY – VERIFY AXLE TUBE DIAMETER BEFORE ORDERING! (if you have the 3 axle tube use kit LA-85). The Load Assist Kit comes with. 2 x BOSS Extreme Series Double Bellow Airbags. 4 x brackets (2 upper & 2 lower). Quality SAE J844 Government Approved Airline. Dual Schrader Valves Mounted in Stainless Panel. Instructions for fitting – NO Drilling required! We also offer this kit with the In-cab control/compressor kit. Please message us for details. We are the oldest BOSS Suspension distributor in North America! Experience counts when it comes to your suspension! Boss Extreme series airbags are rated at 2500lb each and have been tested to over 750psi. Average dual cab ute will run around 15-45psi depending on load. To get the best performance from your kit inflate airbags just enough to achieve a level ride height. By doing this you are also allowing all of the suspension components to share the extra load of the vehicle and not putting any unnecessary pressure on any one individual part of your vehicles suspension.