In 1959 my dad built a 'House Car' out of a 1940's city type bus.
We left Pennsylvania in 1960 headed for California.
In Iowa the engine gave out and he had to replace it.
Because of this, we cut the trip short and only went to Wichita Kansas.
The bus was equipped the same as today's RV's. Kitchen, toilet, bunk beds and fold out couch.
We used it for several years before he sold it to someone who used it as a hunting camp.
It had a three speed manual transmission powered by a 100 HP (I think) Ford flathead engine.
Unfortunately, I don't have any pictures.
Back then, you could park anywhere. People even invited you to park on their property.
It was a much different, and nicer, world.