Most of this thread is about people putting there head in the sand and farting in the general direction of those standing up trying to do something.
Richard and the few others actually doing something to understand the facts, good on you and I hope you put your unbiased findings on here. Have you actually spoken to Tony? or Ken (the LVVTA delegate)?
NZ4WDA membership is wide spread judging by the list of clubs associated with it
http://www.nzfwda.org.nz/clubs/There is a lot of political motivation to reduce 4WD modification, not only to prevent muppets with un safe mods, but also because 4wd bashing was/is popular in the media. I'm sure you all remember the blind spot debate, 4wd accident reports and lots of dead people, babies and animals, unnecessary recoveries all because of 4wds. If you want to see the direction vehicle modification controls are taking, look at some of the rules in Australian states.
If 4wds can have a system along the lines of MANZ or the Hot Rod Association then it is a good thing. If the NZ4WDA has put in the time, effort, money and politicking to get something up and running then I applaud them. There is no barrier to other organisations attempting the same.
The MANZ and Hot Rod systems weren't perfect out of the box, I'm sure the NZ4WFA system will benefit from maturity. They all have fees and standards.
As with MANZ and Hot Rods, no authority card means meeting low volume rules if you want to drive on public roads, the choice is yours.