[3] With over 300,000 wagons and its variants built in the U.S., it was one of Willys' most successful post-World War II models.

[5][6] The Jeep Wagon was assembled in several international markets under various forms of joint ventures, licenses, or knock-down kits.

[8] The steel body was efficient to mass-produce, easier to maintain and safer than the real wood-bodied station wagon versions at the time.

Barney Roos, Willys' chief engineer, developed a system based on a transverse seven-leaf spring.

The system, called "Planadyne" by Willys, was similar in concept to the "planar" suspension Roos had developed for Studebaker in the mid-1930s.