While trying to seek info about an unidentified motor home on this site, I found yet another link that identifies others (just not the one I was looking for):
https://www.gmcmi.com/vintage-motorhomes/

And then, I came across this;
https://www.autoevolution.com/news/1966-dodge-charger-camper-is-the-vintage-muscle-motorhome-you-never-knew-existed-202302.html