At the RV Hall of Fame in Elkhart, Indiana. Here’s a Ford Model T with an early truck camper. There’s a kitchenette/mess box on the left side and a chest of drawers on the right. They both slide into the central unit, then the whole unit slides forward into the body over the axle.

No doubt we could easily build such a camper.

Building a functioning replica of a Model T–whole different project.