If you do go for the caravan route dont buy a static unless it insulated, if I had to do it again I would buy a good tourer which you can still use and go in holiday in, if you have any money left to go on holiday that is..
lived in it ... had real snow on the Christmas tree in the lounge that year! .... DH said it would be character building ! rubbish - was bloody cold, dirty, dusty and a total nightmare !! NEVER AGAIN !!!