My wife and I recently purchased our first mototrhome, a Rapido 665f, and are generally thrilled with it except that a pond forms on the roof whenever it rains and doesnt drain away. At the rear of the van there is a channel running acroos the roof which is preventing the water from running away so a large pool forms in the rear nearside corner, just where the aerial is fitted. The water only runs away when I move the van and then it pours down the front down the cab door which can be a bit of a problem if you open it. Has anyone else had the problem and how was it resolved?