Tony,
I've checked and its 'Trailer, 2 wheel, 8 cwt, (Aust) No.4'. I'm also pretty sure the hand book included 'GS' in the nomenclature as well.
A couple of points: your image shows a flat plate and bracket inside the right hand front drawbar: this is for holding the 'spacer' insert for the towing eye when not in use. The towing eye on the No.4 was large enough to fit the pintle hook on CMPs and USMP vehicles, so to reduce the ring size for the jeep pintle hook, an insert spacer, consisting of an upper and lower half, bolted together, was inserted in to the towing ring. When not in use, the same connecting bolt was screwed into the hole in the flat plate shwon in your image, with the 'u' of the spacer against the short bracket visible on the flat plate, above the bolt hole.
The towing ring had a spring and collar arrangement, and was mounted within the draw bar (ie between the arms of the drawbar), rather than above it as on the No.3 and 3A trailer.
The original wheels for the No.4 trailer were Australian manufactured wheels, not two-piece 'jeep' wheels. Stud pattern was the same. Axle was tubular.
Mike C
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