GMC made its namesake Motorhome from 1973 to 1978. With independent air suspension in the rear and a unique front-wheel drivetrain it was by many accounts well ahead of its time.
See also: This 1977 GMC Motorhome Will Make You Long For the Days of Old.
In this rare video by the manufacturer you’ll see why GMC says,
Driving it is as much fun as being there.
A link to one you might want to add: http://www.rvwheellife.com/?p=2520