An aft suspension system for a pickup truck comprises four corner assemblies, where one corner assembly is located at a suspension position corresponding to each of the wheel corners for the vehicle. An air supply unit includes a reservoir, a compressor, and an ECU is fluidly connected to the corner assemblies. The air supply unit is capable of independently adjusting the corner assemblies from one another. The air suspension system is operable to place the corner assemblies in a unloading position or a trailer, which corresponds to two of the corner assemblies in raised positions and the other of the two corner assemblies located in lowered positions to create a maximum height differential between the front and rear corner assemblies.