This February 1961 mailing brochure marked Form No. DM61-02 highlights the advantages of a jeep. This particular brochure has some wear and a stain, so isn’t an ideal example.
If folded, this was the 8.5″ by 5.5″ front page:
The 8.5″ x 11″ interior: If unfolded all the way, this 17″ x 11″ complete foldout: