I drove a mates POS Cameira stationwagon from Melbourne, via Sydney, Mt Isa, to Katherine, and slept in the car or on the ground all the way.
Anyway, I saw three cars in 24 hours on this road, and I stopped here one night...
http://maps.google.com.au/maps?f=q&h...&t=h&z=18&om=0
And I'm telling you absolutely NO light pollution. I tried to sleep on the ground in my bag, but could not shut my eyes. I stayed awake till 3:00am because of the WOW factor of the detail I had never seen before. If I had a scope I might not have ever left!
Seriously, the air is so dry there, and you are 300km from the nearest light bulb. If I was serious about viewing, I wouldn't hesitate to spend a week there.