Dude.. you can buy a Hilux or Cruiser from a caryard in Cairns, drive it north, sell it, and pocket a lazy 5 grand for your time. Only Toyotas though... nothing else lasts up there and what few workshops there are only have common Toyota parts on the shelf.
Up until recently when the grog bans started, a few enterprising fellas had a good system going. Goes like this.
You find some capital, and buy yourself two LN106 Hilux Dual Cab 4x4s.
You then fill both tubs with cartons o booze (usually VB or XXXX)
Head north.... with backup vehicle
Sell booze and Hiluxes at ludicrously inflated prices
Take your huge wad of cash, and head south again... smug in the knowledge that you have just recovered a sizable amount of the tax you've been paying for the last umpteen years that has been going straight into these peoples pockets every week
On the way back to Cairns, drop in at *undisclosed location* and purchase a sizeable quantity of *undisclosed, but highly desirable contraband flora* for 'personal use only', officer...
Sell said flora to local bikies.
It was called the milk run... and people have bought houses with cash by doing it a few times over the course of a year.