Internet's been a bit slow so i have only just got to read this thread.

Have a look at the manufactrurer's page on welcome to campertrailers.org website home to Australian off road camper trailers since 2001. Last time I looked there were only 147 different manufacturers listed

We have the one we have because I did not want to have to worry about the dirty cover when I arrived, the kitchen is available in 30 seconds (and covered in a few minutes even if you are just stopped on the side of the road), it sets up quickly with the absolute minimum of guy ropes, and the trailer is sealed very well. Having said all that the tent is not huge but would cope with 2 billy lids OK.

Adventure Campers do have hire units - its just unfortunate you're in Brisbane.

Enjoy the planning - and the trip.