Tony,
Your trailer is a 'Trailer, 8 Cwt, GS, (Aust) No.4' (or is it No.4 (Aust) ... I don't remember and am away from the office so cannot check just now). This was the last design of the Australian 'jeep' trailers built in Australia, and is easily recognisable by the high-mounted mudguards (the earlier No.3 trailer had the guards mounted up to the chine (change in angle) of the tub).
There should be a cast nomenclature plate on the rear, low down, which will indicate the manufacturer, type, and have a stamping with either the registartion number or manufacturer's number (depends on which company built it), but this is apparently missing from your, judging by the question you posted.
The 5 digit number shown in your image was not an allocated Aust Army registration number: it fits within the sequence, but the records show a set of numbers, including yours, that were not allocated and left blank in the register. Most No.4 trailers had 6 digit registration numbers beginning with '1', unless it was a trailer allocated to the RAAF, in which case the 6 digit number would begin with '2'.
There are plenty of nicely restored examples about, so you should have no trouble finding out details for your restoration.
Nice looking example, BTW.
Mike C
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