The 1941-43 Chevrolet military trucks had the fire extinguisher placed on the passenger side firewall (see link).

http://chevy.oldcarmanualproject.com/military/1945_46/4x4cmt002.htm

Later somewhere in 1943, GM moved the fire extinguisher to the center of the firewall.


1941 Chevy 1 1/2-ton WW2 4x4 dump truck
In the Stovebolt Gallery
Lots more pictures