This 1942 Americar Brochure includes a page that shows the Willys MA. I dropped out of the bidding at $30. I’ll keep my eye open for a cheaper version of this brochure.
Here’s the page with the MAs on it.
The following images might show the entire brochure in the correct order. Note the page showing the Americar’s “Willys Chassis” … anyone know how similar this was in size to the wagon chassis?