The brains of the system is this Air Ride Technologies' RidePro e-programming unit that allows the vehicle's ride height to be pre-set. Then every time the vehicle is started after the pre-set has been set, it will automatically make that ride-height adjustment time and time again. The unit is simply mounted under the driver's seat.
2003 Hummer H2 Airbag Suspension - Hammering A Hummer