I have noticed some dampness and surface mold on the interior and the basement areas of the motor home. I cleaned the interior completely with a bleach solution. I keep one of the exhaust fans running...
I also use damp rid. They sell it at homedepot. It comes in a big tub, and lasts for a few months, and only costs $5. I also have a dehumidifier, and have to empty the bucket every couple of weeks. All my mold and mildew issues have completely vanished since using them