Ge0rge: The legislation already exists. It is determined by NZTA and assessed by testing authorities.
Got a class 1? Car no more than 6,000kg.
Class 2? Under 18,000kg
Etc etc (with some caveats and exceptions)
Are you suggesting that we should break class 1 into further weight classes/limits?
You're missing the point (perhaps deliberately) and you seem to have missed a few sentences from my post. I'm not suggest legislation changes. I'm not suggesting changes to licence endorsements. I'm suggesting common sense.
I'm not talking about licences for heavy vehicles. We're talking about SUVs here - I think that should be fairly obvious. My issue is people driving large vehicles poorly. I think those same people would do a better job of vehicle handling if they had smaller vehicles.