They do have backpacker oriented auto lots in which you can arrange for them to buy-back your vehicle when your visit time is up. Looking online they are just like you mentioned, hinoranger, mostly campervans and stationwagons.
If a mod does want to move this thread, i wouldn't be opposed.
If you hang around and get to know some folks right around the time you're set to leave you can often times sell off your rig to some people just coming into the cou ntry who need a car just like you did. I've seen a Toyota Hi-Ace 4wd Van that had 560k KM on it and had grafiti from about 12-13 groups of travelers. The travel comunity down there is so much different and so much bigger that selling on rigs usualy isn't that hard.
Cruiser Ute's are a little nicer then the regular tourist heap, but they're are tons of them. Personaly, I would look into buying an 85 Troupy, driving it around for a year then bringing it back home to make us all jealous. Oh and while you;re at it mate, could you send me a 1KZ-Te diesel with the acompanying 5spd, and maybe a few Solid axled's dr. 2nd 89+ Hilux's. Oh and a couple 85-89 4dr Hilux's too
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I seriously thought about doing that but couldn't find anything that I wanted to bring back in time. Be aware, these trucks are used like old chevy beater work trucks here. What we covet, is, to them the tradesman's best friend and VERY common. BUT it means that these trucks tend to live a hard life.
Have you ever been to Australia? If not, I think you;ll love it. I know I do. It truly is an amazing place if you can get out away from the city (not that the city's are bad, just not my style personaly). but hey, you'll have a Ute or Troupy and you can take yourself out to Uluru and Coober Peddy and those kind of places. You want to feel alone in the world, just drive into the middle of Australia, that is one big middle of nowhere and it is AWESOME imo.
Cheers
Dave