Looking at using the Fantastic Fan while in storage

We left our camper in storage in North Fort Myers from Novenber until April. I left the pass through window and a roof vent open thinking that natural convection would keep it ventilated. Bad idea. When we went to pick it up, there was mildew everywhere. Ventilation is no good in such a warm humid environment. You need to dehumidify the air inside somehow. Back home in Seattle I keep it closed up and use a couple of Dri-Z-Air units inside to keep it dry. Change them out once a month.