Mike, the 04 is a fairly different thing to the new grands. It sounds like you have had a good experience, no doubt others have too.
zzkazu, I guess you can modify anything to be suitable..... rear tyre carrier, extra battery mount/holder, long range tanks. All of these things would have to be one off fabricated though, at a fair cost probably.
But as nice as they may be to drive, it sort of sounds like you already have doubts.
I've said it before, but I dont believe grands are tested for Australian conditions before each new model is launched (feel free anyone to jump in here and correct me if I'm wrong). They are winter tested in US and Europe AFAIK and off road tested on 'suitable' test tracks in US. But 10,000kms of corrugations, washaways and potholes?
As far as parts availability etc..... do a search and check out how many people on here have had to wait for parts from Singapore and Europe for late model cherokees, wranglers and grands. (let alone getting parts in Alice, or NW WA) Of course, finding a mech in the middle of no-where who is trained or has experience/knowledge (or a diagnostic computer) on them is another thing too. Sure, as someone else said, try fixing a new 200series LC out there...... but chances are it will have been seen/done before, seeing as there are probably 200 cruisers and patrols out touring to every Jeep.
My opinion is based on all the above i guess.
Oh, and I have a patrol for touring too, before you ask. For these reasons. Oh, and its the old 4.2 that will run forever, not the 3.0 diesel hand grenade with a loose pin.