The GMC Motorhome was produced by the GM Truck & Coach Division for the 1973 through 1978 model years in Pontiac, Michigan, USA. 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.

https://en.wikipedia.org/wiki/GMC_motorhome