Auzzies do it for lots of reasons:
1: Far more companies who specialise and understand Patrols / Cruisers making it easy and reliable to modify, incl diffs and availability of quality parts.
2: You cannot drive their trails running 33's because they so rutted from 35's... thats why they all starting to run 37"s - natural progression
3: Far greater access to real-world engine mods (particularly Diesel powered motors) , Making it easy to turn that rubber.
4: Highway speed limit is 100km/h. So even if your motor is bog standard, there's no real issue on the road anyway.
The irony is that its illegal in most states there to run 35's or bigger. same goes for anything over a 2" lift. Unless they get it engineered approved.
If i had my way i would love to change my gearing to 4.3 / 4.6 on the pickup and then run a 63% transfer case reduction gear for low range application. using 35's.
'07 Patrol Pickup TD42 N/A,285's KM2,3" Lift,ONCA Bars,Warn High Mount,Alu Canopy, and some other Stuff.