2 inch lift tyres?

If you want to be legal, ask your state rego authority.

I've only ever had 30's and I can safely say that I have only got stuck once in a situation where bigger tyres would have helped.

I was bellied out on the hump between some muddy ruts that were chewed out by guys running 35-40" mud tyres and there was no way tyres that big would fit under the vehicle anyway.

Bigger tyres cost more, take more fuel to turn to turn, put more stress on the drive line, don't do your low range gearing any favours and make bugger all difference to ground clearance.

You might get away with 31's, but much bigger they will probably start rubbing in the wheel arches, particularly when the suspension is compressed and you're turning.

The National Code Of Practice says:
"*4WD goodsvehiclesand their 2WD equivalents if the chassis and running gear are essentially the same as the 4WD version (N ADR category);
or
*any medium weight goodsvehicle (NA2, NB ADR category).

Must not be more than 50mm larger or 26mm smaller than that of any tyre designated by the vehicle manufacturer for that vehicle."

So, in summary, 50mm diameter larger (which will give you 25mm more ground clearance, until you let the air out of it to improve traction), but that is based on the tyre placard, not what is actually fitted to the vehicle now.

Punch the data into this tyre size calculator and it will tell you want sizes you can look at, but won't tell you if its going to rub on the body.

By law in most states, you can only give a car a total lift of 75mm Your car already has 50mm. This means that you can go 50mm more in tyre diameter which gives another 25mm lift. The starting point is the largest tyre size listed on the tyre placard on the car. You can't go past 50mm larger than that in most states. I think a Triton tyre placard lists the size as 245/70/16 which is a 29.5" tyre so 31.5". That's around a 265/70/16. 20mm is the largest you can increase the width I think? If you're in NSW it's not a 50mm increase, it's a 7% increase in diameter that's allowed provided the total lift isn't over 75mm. All this is dependent on the tyre not scrubbing. I've found that if you stay legal the tyre rarely scrubs. Stay legal for insurance purposes, plus large tyres will break your car because they put extra strain on the drive line, especially if they're spinning in the air and drop on a rock or tree root. There are a lot of illegal cars on the road.

The maximum 'lift' has now been ratified [without engineering cert] to 70mm overall , ergo you have put in a 50mm lift which allows you legally another 20mm in tire size [ that does NOT mean you insurance allows it ] Your normal size is a 245 so you 'could' go to a 265..BUT you may have clearance problems requiring some minor body 'chop'.... you gain 10mm under the diffs ... is it 'worth it'.. ?

"Bigger tyres cost more, take more fuel to turn to turn, put more stress on the drive line, don't do your low range gearing any favours and make bugger all difference to ground clearance."
All true plus one more important consideration: Bigger diameter tyres decreases braking efficiency meaning that the vehicle will be harder to stop. Also you will need to adjust your speedo gearing/calibration for it to remain accurate.
Unless you are doing a lot of mud work you are wasting your money fitting 'muddies' as they wear faster than A/T tyres. Also with your suspension lift the correct wheel alignment may be harder to maintain leading to irregular wear patterns, scalloping, etc