"Built like a Battleship - Drives like a Sports Car"
The station wagon variation was a puzzle (twice) before:
http://www.autopuzzles.com/forum/index.php?topic=6784.5Powell also offered a variant they called a "sport utility wagon", and a camper. They later tried to make a go at producing an early Winnebago-like one-box RV.
The yellow truck, above, is a '56. The Prototype was built in '54, production models spanned 1955 - 1957. While the production model chassis was from a '41 Plymouth, the engines came from a variety of cars and, in some cases, marine craft.