Here’s an ad for a clever Ford Station Wagon that has a handy stowaway seat feature. The Station Wagon has 3 rows, but the 2nd and 3rd row can be removed.
This mini-van pre-cursor boasted of its ability to fill the car with people or stuff.
The 2 page ad with a fold-out appeared in the August 1950 edition of Flair magazine. It boasted of its power and styling.