A couple from the Netherlands bought a used caravan for €12,500 on Marktplaats. During the first heavy rain on a campsite in Zeeland, water ran down the interior wall, soaking a seat cushion and forming a puddle on the floor. An expert later found moisture damage in several places, likely covered up before the sale; the repair cost an additional €3000. In Germany, private sellers can exclude warranty claims with the phrase “sold as seen”, and buyers must prove the seller knew about the defect. ADAC advises insisting on a current moisture measurement and written confirmation; a damp check costs €50 to €200.