If you come out west (I'm in Stawell next to the Grampians)
Vline Train goes to Ararat, Bus comes through Stawell and beyond
I would be happy to drop you off to a camp site, there are plenty to choose from out here.
Grampians National Park, Lake Lonsdale, Green Hill Lake, Mt Buangor State Park, Mt Langi Ghiran State Park
Mt Cole State Forest, Pyrenees ranges, Mt Arapiles - tooran and that's just off the top of my head.
Really depends on what kind of camp site you are after, Lakes are nice and full out here after all the rain earlier in the year.
Some national parks have long waiting lists for camping reservations.
When you have to wait a year to sleep next to a tree, something is wrong. ~George Carlin