The design, using as many commercial components as possible to improve reliability and the rate of production, was standardized in 1940 and built by the Autocar Company, Diamond T Motor Company, and the White Motor Company.
M3偵察車的車體採用了儘可能多的商用組件，以提高可靠度和生產速度的設計，並於1940年標準化，由Autocar Company, Diamond T Motor Company和White Motor Company製造。