going off topic a little this is another interesting (to me anyway) American made tractor unit in service with the Australian Forces.
It is a Reo tractor unit towing an oxygen generating plant and was in use by the RAAF. Note the unusual cammo.
This is one of a series of close up walk around photos of this Reo taken in Sydney during WW2 although I do have 1 or 2 other pictures showing it in Darwin.
Photo is from the AWM.
Cheers
Cliff