So checking up on my Truck Camper this morning, I replaced the Dry-z-air dehumidifier and gave it a look see, I noticed a couple tiny spots of mildew cropping up. I thought I was pretty thorough in storing it by draining all the water, propping open the fridge, covering it with a tarp, and putting one of those Chemical thingys in there, but Im still getting this mold.
Now I plugged in a small space heater set on low hoping that the warm air circulating will defeat any seeping moisture or humidity.

Am I on the right track here or is there something I'm missing?