Water Ingress or leaks inside the caravan is the number one problem with second hand caravans repairs. By running your hand and pressing the walls around the vulnerable areas ie in the top corners, along the top sides
and around the if it's soft, feels wet or has dried and you can press through the paper then its got major water damage. Most caravans for the past 30 years have had the same construction, a thin painted aluminium panel is bonded to polystyrene for insulation, this is in turn bonded to a thin wooden panel which has the glued finish to it ie vinyl paper. This glue is waterproof so what happens is that all the water is retained behind the paper but any wood rots around the window, the corner edges and top edges where the awning rail is attached the wood will be wet and rotten. The picture shows the blackened area where the water has damaged the paper wood finish around a corner in a touring caravan, this damage is not easy to spot and may not even smell damp. One tell tale sign is that the paper may have hard spots on it, this is mold growth drying hard behind the paper when its wet. Repairing a damaged caravan like this is expensive and labour intensive, if the caravan has an immediate value then of course a repair can be made but on a second hand or older caravan then an expensive repair will resolve the issues but may not add any more value to the caravan. Other considerations of older caravans is the cost of replacing items that don't work. A mixer tap can be anything from £50-£120 a water pump system the same, integrated battery chargers £300, one window £500, let alone a three way fridge £800, truma fire with electric heater and blower £900. The front window restoration on the gallery pages cost over £1900 to undertake but the value of the caravan was maintained.