Your truck has some features that are not standard on 15 cwts (at least based on my mainly Chevrolet experience) 20" wheels, helper/overload springs, winch, cable guide under rear of frame, transfer case with PTO for winch.
All of these features should be on a gun tractor but could also result from a larger truck being cut down to better suit its post-war use. Look for signs of frame modification to take a better guess - my thought is that the external reinforcement is probably due to the crane added. The cab floor may also give help. do the openings for transfer case shift lever look factory or "gas-axe" made?
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