Steve pointed out this engineering report from Willys Overland.
“original SAE engineering report , 8.5 x 11 , 12 pages , last two pages are torn with small piece of paper missing at edge , this report was presented by Willys Overland in January 1946 and describes light cars in the US and compares various light cars . The Jeep was not mentioned but it was the only “light car” being produced by Willys Overland at this time .”
I suspect car “G” in the tables is a Willys, due to engine size 134.2ci and wheelbase of 103+ inches. The 2WD Willys station wagons which came out in early 1946, after this study, would have met these requirements and so would the Jeepster, both having 134.2 ci engines and 104 inch wheelbases.