Been to Australia once. Flew into Sydney and then to Canberra for two weeks. Beautiful by air as well. Absolutely loved your country sir. Hard pressed to find a friendlier bunch for sure. I'd go back in a heartbeat. You must have your petrol delivered and have a tank on your spread? 150 miles is a long way to go for groceries or a fill up. bet you carry some jerry cans with you for those times when you might not make it.
Great choice of vehicle. Right hand drive i presume. it was a little strange at the round-about at Canberra Airport, but you get used to it pretty quick.
I'm sure that if you are using it mostly for transportation in the bush, it will be fine. It will be worth the wait I'm sure. I've had a TJ and two JK's and not a problem with any. Of course I don't drive it off road much. Primarily in the fall hunting season and on a lot of wood roads more than rocks. Nice to have the reliability and 4 wheel extras when you need it.
Welcome to the forum.