The CMP trucks were made by both Ford and Chevrolet, the only things in common were the cabs and bodies. The fuel tanks of the short wheelbase models were mounted on the left side partially underneath the cab. on the longer wheelbase models the fuel tank was further back with only about 6 inches below the cab. In photographs there appears to be a variation in size and on the Ford it is further below the bodywork. On some special bodies the fuel tank was mounted transversely behind the cab. Some had a fuel tank on the right hand side mostly Fords. The main way to differentiate between Chevrolet and Ford vehicles was the radiator mesh and the differential housings, the Chevrolet having a diamond mesh grill and banjo housings, the Ford had a rectangular mesh and split housings.