There were a couple of "gumball rally" type events held in Oz years ago. Not the Cannonball Run in the NT but Sydney-Perth.
Totally crazy stuff. The guys my mum knew got a falcon and modified the boot to be a fuel tank. 1 driving, 1 awake watching the driver, 1 asleep in the back. They'd change seats on the run and only had to stop for juice a few times.
The guy that won had a ute with a fuel tank that filled up the tray!!! 8O 8O
I think it died out after a few years when some of them got arrested.... :roll: