On the plus side, even though I've made approximately ten bajillion phone calls all up and down the south east, I'm probably only out, like, a dollar. It doesn't cost much to be told repeatedly, "Hell no, not a chance."
Unless of course you thought to make your bookings a year in advance. For a freaking unpowered camp site. Seriously, tourists, the Great Ocean Road is not all that great. I think you should all take your tents and your caravans and hit some other road, Jack.