This brochure that Marc found shows the CJ-3A employed in a variety of jobs. The use of the triangle in the illustration is interesting.
“This listing is for a vintage advertisement. It is an ad for Willys Overland Motors of Toledo Ohio and their universal Jeeps. The ad folds out like a small poster. There is a dealer address stamp on it. I am not positive but I believe this advertisement is from the 1930’s. It is filled with information and pictures from that time frame. It is roughly 17″ x 11″ when it is unfolded.”