There are HEAPS of RV's in the Perth area and everywhere else in Western Australia as well. Jandakot is Perth's secondary airport for GA. The Jandakot chapter of the Sport Aircraft Association of Australia (same as EAA) is chapter 24. The chapter contact can be reached on 08 9452755two when you get to Perth. I'm sure he will hook you up with some Rver's in the area.
Enjoy winter in Western Australia ( about 15C Temps at the moment)
Cheers
Graham