Just as something to consider...
On the Newnes Plateau, just outside of Lithgow, NSW, is the Bungleboori Campground.
https://mapcarta.com/N1811163549
There's not much in the way of facilities, but there are some nice flat open areas nearby, and through the week the campground doesn't see much in the way of people. On the weekends though, it's a haven for the 4WD crowd and dirt bike yobbos.
Just a thought.