By "full" running boards, I assume you mean clear back to the rear fenders. Yes? If so, Willys didn't do that with their wagons. At least not from '46 on up. Maybe some models earlier than that, but I don't know of any "delivery" wagons in the Willys line that early I believe some sedans had full boards.
Chevy and ford had them on their delivery vans though.
Steve