Try and make up a wish list of what you need, will there be kids,what are you towing it with, do you need "full off road" capabilities and be self sufficient, do you want a quick over night set up or are you prepared to spend half an hour setting up and an hour or more packing up
Try doing some sticky beaking at the local camping areas when there are a few people around, most will be very helpful and more than happy to show you their campers and there are a couple of swaggers in Broome as well.
Good luck with the search