I had the chance to buy one of these trucks about 20 years ago from Prices in Dalby but couldn't raise the $12,000 quickly enough and it went to South Australia.
At that stage I didn't know that some had been to Vietnam or I would have tried to deal a bit more with Prices to save it.
I have kicked myself ever since as one of them with a little low loader would be good to take stuff to Canungra, easy to drive with auto transmission, 250hp Cummins and from what I saw well set up for the small operator.
The only one I saw in army service was going through Chinchilla to an exercise up north, it was towing a double axle trailer and had two enormous guns on board.The guns were on the trailer at an angle with the trails side by side to be able to fit on.
Ken