First published 09/29/2012: I first spotted this article in the May 22, 1943, edition of Colliers Magazine.
An article by the same name (Jeep of All Trades), but with different content, was published in Mechanix Illustrated in November 1945 (see an example at this-old-jeep.com).
Below are some images of the article. I searched on the author, but all I learned was that he wrote for Colliers. If you spot an inexpensive Colliers Magazine with the article, let me know!