XU4 is simply a de rated van or ute like you suggest. Basically the reason for a derated van or ute is it came from the factory with sedan tyres. Not commercial tyres. So they handled better. Due to the less ply rating of the tyres they couldn't handle as much weight. This giving you the less weight rating.
XU3 is the sandman package. Non derated van or ute.
XX7 is the sandman package with sedan tyres (derated)
There was no derated sandman pre October 1976. So early HJ and all HQ where not derated and where all classed as a XX7.
XU3 only started in October 76.
XU4 not sure when it started. It may have started in October 76 like the derated XX7.
Cheers
Jason






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