this is nuts, a 65 Merc made into an RV... the Great Dale House Car is a car/camper conversion built of Denver, Colorado in the 1960’s. Estimates say there are a dozen of them still on the road today.

Dale Wasinger of Denver, Colorado got into a business of adding campers to cars that were only half wrecked in collisions

https://www.hemmings.com/stories/1965-great-dale-house-car