G'day Monique-Wilson,
The Mrs and I have done 2 laps of this great country 1st lap was 9 months and second 10 months, both using an Eezi-Awn rooftop tent very good quality (South African made.) but would we do it again with one YES! (if we hadn't now had kids!
) so I'll list the pros and cons for you as we found them.
Pros
Quick set up and pack up time - we'd stop, i'd set up the tent and Mrs would put a brew on, set up finished before the coffee made! as we moved most days ease of set up and pack up was very important.
your accomodation is always with you so if you have a change of plans no heading back to a site to collect stuff
Your off the ground so no snakes and spiders in the tent, and if it floods anywhere you have no problems - we had a few possums trying to get in!and we woke up one morning to 2 foot of water on ther ground but hadn't worried us!
our roof tent opened over the rear of the landrover and had a kitchen in the back of the car so that provided some shelter for cooking
Cons
If you want to pop out for a beer or go out for the day and return to the same spot you still have to pack everything away
limited shelter in bad weather - we had a 4m by 3m awning made to give us some shelter, but when raining it would have been nice to have walls as when rain goes horizontal or even at at 45 degree angle you tend to get wet
Fuel consumption goes up by a small amount
Vehicle centre of gravity raised, but we never had an issue with this, as long as the driver is aware - we did the cape and gunshot creek with no problems
We have loads of pics of the set up we used, and would be more than happy to answer any questions you have. If you head up Sydney way at all get in touch and feel free to drop in. Would we use ours again YES, but we have kids now...... So PM us if theirs anything you want answered and we'll try our best to help, or if you want any pics.
Cheers
Andy