I don't recall seeing photos of the complete unit but will keep my eyes open.
The tag describes it as "Truck No. 2" so presumably there was a No. 1 and possibly No.3. Presumably the equipment was too large / heavy for one truck or had components that could interfere with each other.
The tag gives a serial number 364. Without proof, it seems unlikely that they had 364 sets for domestic use. Assuming they were sent overseas it is possible (assuming there wasn't much production in Australia) that one or more sets might have been sent home for use / study / prototype.
Most of the above is guess or speculation I need to see if I can find anything to prove or disprove it.
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