I am basing my comments on what I have seen when we were in Australia. Australian caravans can not be compared to UK caravans. They are built to withstand use in the outback, they are seriously hefty bits of kit, although I will concede some of the Australian folders could be under the cars weight limit. I am also trying to take into account that Australia has nice weather, and by nice I mean hot compared to UK, this will have an effect on the cars performance when towing.
At the end of the day if you feel otherwise that is fine by me.