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Systems run the gamut from just having external air valves with lines running to the air bags, up to adding on-board compressor, in-cab control, reservior tank, and extra air line for filling air-mattresses, tires, balls, etc.
You can install the system yourself or have the system installed for you by your dealer. Mike L. has a simple AirLift system that he installed himself, while I have Firestone Ride Rites with compressor and in-cab control, which was installed by my local Les Schwab Tire Center.
The important thing to remember for your application is to NOT tie the bags together. This configuration will help reduce sway and "porpoising".