As the only complete motorhome built by a major automaker, the GMC Motorhome was available in 23- and 26-foot configurations, and were noted for FWD and a low profile with a fully integrated body.

It was not only unique but widely progressive for the era. Two versions of the GMC Motorhome were built: a 23-foot (7-meter) variant called Birchaven and a 26-foot (7.90-meter) variant named Royale.

The body was built out of aluminum and fiberglass. Depending on the total length, it was called either Birchaven (the 23-foot/7.0-meter variant) or the Royale (the 26-foot/7.9-meter) variant.