The Command Truck M42 is only slightly different from the base model M37 cargo truck. They are not manufactured as a separate model, rather the M42 Command Truck is created by modifying an M37 with the installation of a conversion kit. The M42 conversion kit consists of replacing the standard M37 canvas with these M42 components:
Body side curtains with windows
Split rear end curtains
The regular canvas tarp was rolled up on the sides, secured with leather straps, to expose the side curtains. The window panels were made of a non-reflecting plastic material. Sources differ on the provision of an entry step ladder for the M42 Command Truck.
When the M42 kit is installed, an M42 dataplate is added to the M37 dash (photo, below). Trucks configured as the M42 Command Truck were also converted back to the M37 configuration. According to TM 9-8031-2 Change 3 dated 29 January 1968, all references to the M42 Command Truck in the manual were deleted.
M42 Command Truck conversion kit dataplate.
M42 Command Truck, from TM 9-8030, May 1955.
Rear view, top cover and curtains, Command Truck M42. From TM 9-8030, May 1955.