My dehumidifier is as important to me and my camper as my air conditioner. It is very frequently cool and damp overnight in FL in the winter. Although electric is usually included in the rate and a small electric heater will do I use the dehumidifier. It pulls over a gallon of water in an overnight and throws just the right amount of heat for the chilly but not real cold nights. I'll run the AC with it and if it gets too hot the ac compressor will run for a bit with it. No sticky sheets. Without the dehumidifier its clammy. I'll never be without one in a motorhome again.
If I was storing a bus with cruisair I would definatly run a portable unit to cool it. Exercise is also important. Run everything 1 hr once a month. This was what seemed logical advice I got years ago from a dealer.