Hello we have just bought our caravan and as it is stored near barns and trees we would like to invest in a cover. I have heard bad points for getting a cover ie: sweating and damp. Would a roof cover be better. Has anyone got a cover for their caravan and if so wheredid you get it from, there are so many companies selling covers I am baffled to which is the best if any at all. Views on this much appreciated.