Caravans tend to be closed for long periods, and the damp which builds up inside them during this time can cause stains on fabrics and rust on metal parts. While they are in use, as they are a small space, there is a lot of condensation generated inside, leading to an unpleasant sensation of dampness. I recommend using a moisture absorber to prevent all these problems. Look at this webpage http://www.humydry.com/en
Edu, November 2008