That's really sharp. About fifteen years ago, here in Tampa, I saw a 1939 Ford Truck (one ton I think) with a camper body that looked very much like the one on the '37. As I recall, the top actually cranked up (all four corners at the same time) and there were screens in wood frames that fit in the openings. the truck camper also had a small "potbelly" stove, two burner cook top and small oven.
In Yuma, Arizona there is a Model A House car that is as complete a unit as todays motorhomes. Not as modern, but it had all of the basics. It is in the Model T museum in Yma, AZ.. The guy that has the museum has 118 runable Model T's sitting on blocks. It's all outside and extremely interesting. He said that he thinks the House Car is a factory built item. He has owned it for years.