Motorized Wheel Chair Source

michael s says:

You can actually have airbags installed in between the leafsprings and frame of the vehicle. The air bags come with a small air compressor that is installed underneath the vehicle and inflates and deflates the bags from a control unit inside the vehicle on the dash. It will probably cost about $200-$400 for an airbag kit installed. Firestone actually manufactures the bags which are very durable and will last you a very long time. This will also help to releive some of the pressure the wieght is putting on your leaf springs and rear shocks. It is the best way to go because you can control the height of the rear of your vehicle from inside of the cab of your car. The air shocks that other people talk about require you to physically hook up an airhose when you want air in the shocks and physically let the air out when you don't want the shocks so high..I would not recommend these as they are a pain for someone in your situation where you are constantly changing the rear height of the vehicle. The air shocks were developed for street and drag racing assuming people would only make adjustments during racing, not everyday driving in which the rear load would dictate at what height you want the rear to be. Again, I would stay away from the air adjustable shocks and look into installing airbags, much more efficient and adjustments are made on the fly from the comfort of the cab of the vehicle. Good luck