How big are your tyres in SA?

Well having spent a few days in Adelaide, yesterday I decided to check out the 4-wheel driving spots around Adelaide using an old thread from here for directions. Ended up at Cox's scrub. At the end of Ridge Rd about to enter the area, went to drive through a fairly innocent looking puddle. That innocent looking puddle was about 2-3 feet deep, with ruts where 33inch MTR's couldn't touch the bottom. Fortunately there wasn't any real damage and the local farmer wouldn't accept any more than $10 for pulling me out, so a fun afternoon that is all part of 4 wheeling with a lesson learnt the hard way. It did get me thinking though, 33inch MTR's didn't touch the bottom of these ruts, I know a number of people in SA run 35's, anyone running anything bigger than 35's, and how did you get them ADR approved? I am not out to have a go at anyone just curious and thinking about running two sets of wheels myself.

Cheers

Snowy