There are plenty of people ready to help you with that dream. One such company is My Drive Holiday Campervan Hire Austrailia.
For a quick look at campervans currently available click on: CamperTravel.com.au. The site lists everything from ‘hippie campers’ ($55/day) to ‘offroad 4WD rigs’ ($99/day) to roomy Class C motorhomes ($260/day). As with all rental policies, there are also extra options and fees. Read fine print carefully.