It's correct that it's an ADR requirement - this is the issue as the towing vehicle requirements are the ADR spec as manufacturer's original equipment for the towbar and manufacturer's design towing mass for the vehicle so this is where the rule on the towing vehicle comes from.
Trailer rules are different and do not align with the towing vehicle rules - although as people have said it is very rarely picked up on. I've only ever seen it picked up once at VTNZ and that was I think due to the towing vehicle and the trailer going through wof at the same time.
Max unbraked on the trailer rules are 2000Kg, but the towing vehicle can't pull it in alignment with the laws and original manufacturer ratings if the trailer weighs over 750Kg without brakes. There has been a review on in LTNZ for a while on brakes but there isn't much happening with it as far as I'm aware, probably as it's going to create a hell of a mess whichever way they go if they try to get everything aligned in terms of trailers meeting the ADR rules.
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