I'm in a very humid coastal climate. My rig is plugged into 50 amp all the time, with battery switches left on. Heat and a/c off with rig closed up. Jacks retracted, and slide retracted. Refrigerator off and doors propped open. A dehumidifier sits on the kitchen counter with the drain hose in the sink. I leave the gray tank valve open so the condensate can drip out onto the gravel. This works for me.
Fred & Vicki
Richmond Hill, Ga
2000 H.R.Endeavor/Freightliner/330 Cat