Help - what is she?

[motto]

The truck is obviously one that was intended for military use as indicated by the roof hatch. It also has an Australian cab with opening windscreen which I doubt was ever a feature of the civilian version. It appears to have a heavy front axle which may indicate Maple Leaf origins and is on 20" wheels although these may have been changed at some point.
I can't tell much more from the photographs. Does it have a two speed rear axle?
Does it have a tow hook? If so what type of mounting is provided?
Is there possibly a number on the side of the bonnet?
The word 'CHEVROLET' should be pressed into the lower most horizontal bar in the grill in large letters.
There should be 10" deep chassis reinforcements on the outside between front and rear spring hangers.
There should be a chassis number as Mike stated stamped near the left front spring hanger. They are usually not deep and numerals fairly large and not obvious.

David