Yeah, it's terrible! Worse than Montana. You should totally stay away.
Just yesterday (peak summer holiday period and 30⁰C) I drove my Ford station wagon that's fitted with illegally sized off-road tires 2 hours out of our largest city, spent an hour or so hiking up a river bed to a swimming hole with my son. We swam, we jumped off the rocks, my son climbed up a 70' waterfall, and we saw a total of about 12 people on the way up the river to the swimming spot, and no-one at the swimming spot.
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In terms of wheeling, build your rig within the law, and you'll find you can actually get out into the bush and enjoy it just as much on 33" tyres as you can on 40s.
People push boundaries a little, but you run the risk of being fined, vehicle ruled unroadworthy, and/or insurance likely to be void if you have an accident