If you thinking of taking you RV to some more exotic locations than the norm you might find you need a Carnet de Passage. This simple document avoids the necessity of paying import duty and trying to get it back when you leave. The only place to get it in the UK is from the RAC but they are horrendously expensive so if you need one try ADAC the German motoring organisation. They are much cheaper and you get your money back quickly after the trip. We needed one for our trip to North Africa and the Middle east and ADAC saved us thousands of pounds!