I have same car and a large 4 berth (22 1/2 ft). It is okay and will do the job. It will struggle on very steep inclines but there again most cars do. Will trundle along at 60 on the motorway quite happily.
We are looking to change our car and need to check the towing capabilities of possible car choices. Does anyone know of a website where you can enter a car details and it calculate the max weight of a caravan it would be able to tow.