I think I see a differential housing on the front axle - so at least one seems to be on a 4x4 chassis.
In the Canadian context, I only know of one type of 16 inch CMP rim (other than the lightweight, 6 securing studs to the hub, version used on the C8A HUP series). I believe the photographed truck has 8 studs to mount to the hub. Also, I don't see the characteristic stepped center of the 20" wheel. Did Australian production get different 16" wheels compared to Canadian (most Canadian I've noticed were made by Kelsey-Hayes)?
I don't know anything about the Australian wireless bodies (except that they seem different to the Canadian ones, based on your photo), sorry I'm not more help.
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