Good words here, but not entirely legislate yet. We have a grey area in our towing laws whereby the NZ trailer tow ratings do not line up with the vehicle manufacturers rating. In Aussie they do under ADR63 regs and currently NZTA is planning on a major review on this subject, as I have sat in on a meeting in Wellington relating to it.
I would suggest you go down the hydraulic disc brake on one axle of the tandem trailer rated at up to 2500kg. Make sure your tow ball is rated high enough as well, would suggest a 1" shank ball is used as well to obtain the correct rating.
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