The illustrator for this drawing is unknown, which is a shame because it’s such a precisely rendered cutaway of a 1949 Nash that had been converted into a camper.
Lucius Sheets of Huntington, Indiana, converted his Nash into a camper that allowed him to sleep, cook, and eat on the road, saving motel expenses.
The right rear door, where the woman stands, was the meal center where basics could be stored. A piece of plywood attached to hooks near the food center and served as the table. Mr. and Mrs. Sheets preferred to stand while eating.
Best as we can tell, Lucius Sheets died around 1979.
Source: Popular Science, October 1952