There is a small caravan park at Spring Creek near Cliftom north of warwick. They have just one on site cabin (it's very comfortable and well equipped). There are very few lights around, I took some astro shots from there a year or 2 ago (only with camera on tripod). But there are also lots of empty roads and skies all round. Might be somewhere to consider.
http://maps.google.com.au/maps?f=q&s...h&z=11&iwloc=A