After being used for a season, a camper/caravan can get really moist inside. The mattresses, pillows and similar items can literally contain many fluid ounces of moisture. It is recommended to remove such items from the camper/caravan before parking it for the off-season. Before locking it up it is also strongly recommended to give the camper/caravan time to air, so the largest part of moist can escape. After removing the mentioned items and proper ventilation, you can place 2 or more ZARPAX dehumidifiers inside. The same goes for boats) ZARPAX RV/Marine is ideally suited to the task.