In the early days of WW2 there weren’t enough jeeps for the Army so there sure weren’t any jeeps for the movie industry. Hollywood had to build their own replicas. An audience that had only recently learned about the jeep wasn’t likely to know they were seeing a replica. It looked like a jeep….ran like a jeep…so it must have been a jeep. Laurel and Hardy go thru their comic antics and during parts of the movie, “Great Guns!”, they use their jeep during manuevers.
See the December 5, 1941 review that appeared in the St. Petersburg Times.
How about a book on the early jeeps? Try Jeep – Its development and procurement under the Quartermaster Corps, 1940-1942 or BANTAM, FORD AND WILLYS-1/4-TON RECONNAISSANCE CARS, both are available from Amazon.com or other booksellers.