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This website will keep you occupied for a while. :P
You might have to sign in to view all the pics but it is worth it. There is heaps of good info in there.

auszookers.com • View topic -...

I'll see what I did with the pics and send them to you. Might give you some ideas for yours anyway.

What zook you got?
I got a few pics of designs I used for my zooks

Here's a few ;)

http://i964.photobucket.com/albums/ae121/CEMEMOTORSPORTS/4WD/HaymanReesehitch.jpg

http://i964.photobucket.com/albums/ae121/CEMEMOTORSPORTS/4WD/Vitararearbars.jpg
...

Who knows??? NZTA will make it up as they go along like always.

Like VC said, just do it.
Make the tow hitch a Hayman Reese type though ;)

There is nothing to stop you, at the present time, making your own towbar for a light vehicle.
Only towbars capable of towing more than 2500kg are required to have relevant load ratings and certs...