I own a fleetwood volante 560/4 2003 had it about 6 months.Today on the caravan storage site using a pair of steps I decided to inspect the roof. What I found was like a pond on top,obviously the roof is concave rather than convex and holding the rainwater.While up the steps I looked around at the other vans and most of them were clear of water.Inside the van there is no sign of damp,is this an impending disaster waiting to happen and I have bought a pig in a poke or is this okay on caravans?Your thoughts are most welcome as I have only been in this game for two years.