Go to Camper World or online and get a couple Goldenrod dehumidifiers.

They cause a warm convection current......not hot enough to catch anything on fire, but safer than a lightbulb and waaaay more effective than Dri-z-Air. We sell the 24" model to dehumidify aircraft stored over the winter in a musty, fusty hangar and they work very well at preventing mold/mildew and corrosion in the avionics.

It will probably require 2 of the three footers to keep your camper dry.

http://www.go2marine.com/product.do?no=78204F&WT.mc_id=gb1
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She was standin' alone over by the juke box, like she'd something to sell.
I said "baby, what's the goin' price?" She told me to go to hell.

Bon Scott - Shot Down in Flames