it has been already said, don't do the cape with it . There is a mob up at Cooktown that hires out campers and it is not all that uncommon that people who have campers tend to leave theirs at a caravan park and then hire one to go up to the cape. From mmory , I think trektec has been up to the cape, contact him. As far as the Jayco product, you see it everywhere and most of the time you don't hear of any grumbles. so they must be of reasonable quality .
I have a Kimberley camper Kakadu 1997 model, and I use that for soft camping, I don't think I would take it to the cape purely for the issue of fuel consumption alone , I mostly swag it and also now I have a rooftop tent .