The GMC motorhome was produced by the GMC Truck & Coach Division of General Motors for the 1973 through 1978 model years. It was the only complete motorhome built by a major auto/truck manufacturer producing what GMC hoped would be their halo vehicle. Part of the reason this vehicle is so different from other motor homes of the era is that it was not conceived as just a "camper," but as a vehicle for comfortable travel as well. The design was radical for the day with front-wheel drive and a low profile, fully integrated body. At the time (as now), motorhomes were built by recreational vehicle manufacturers on bare frames and drivetrains supplied by a chassis manufacturer. GMC built the bodies and in most cases the interiors in-house, and designed the chassis and drivetrain to create a motorhome enclosure that could be adapted to a range of purposes. Empty shells were supplied to other RV manufacturers for upfitting the interiors and also to specialty manufacturers for a range of custom purposes ranging from mail delivery and mobile training facilities to people movers and ambulances. It was built in 23-and-26-foot lengths.

12,921 GMC motorhomes were produced from model years 1973 to 1978. Over 7,000 are currently listed in an international registry. Estimates suggest that at least 8,000 to 9,000 of the original production are still in running condition.

The vehicle was built to allow flexible use of the interior, and thus is ideal for recycling for modern needs. Newport Stair & Millwork specializes in modernizing with new technologies including satellite electronics, digital audio-video equipment, custom cabinetry, exotic floors and new designer upholstery and appliances to make what has been called the "26-foot, 12,000-pound antique hot rod with plumbing."