They are pretty much the same size as the No.5 Trailers. I had a bit of a look over some at corowa. Nice trailers, but a bit more complex than the No.5 due to the independent suspension.

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1981, Series 3 FFR. 33-727 - Grover
1961, Series 2 Ambulance. 108-098 - Eden

Registry of Ex Military Land Rovers Mem. 129
Defence Transport Heritage Tasmania Mem. 12

You know, strictly speaking, throttling the staff is my job