Ingrid (58) and her husband bought a second-hand caravan for €12,500 on Marktplaats. On their first holiday in Zeeland, heavy rain exposed serious leaks. A specialist found long-standing moisture damage, including affected wood behind a wall panel. The repair cost another €3,000, and the seller said he was unaware of the problems. Because the buyers could not prove the seller knew, they had no legal claim.