You can tow it with a car
Not all Australian Touring Caravans weigh 8000lb, there are lightweight single axle models, like this 4,200lb , 22ft version that can be easily towed by a car.
Forum Discussion
In my opinion, comparing Australian/European trailers to those built here is apples-to-oranges. Design-and-build-wise, about the only thing they have in common is that they all have tires.