We drove from Brisbane to Cape Tribulation in an XF Falcon in about 1989, 4 blokes with a carton of beer in the back seat aswell. We took one tent and camped along the way, we found some nice beaches to camp on for free. ahh back in the old days
It will be hot at that time of year, so stop for lots of swims on the way.
yeah check out Gyspys ozcamps link up there for some ideas.