I should probably add I live in the northern California foothills, so temps are usually mild, without the valley fog. We do get some fog during the winter, but not much where I am. Great Ideas all, The vents/fans may be the best option since I'm sure they can be Solar power. Does the movement of air also work duing the Winter? The trays of dececant, is this like cillica packs, and if so, where do I get some. That is why I was thinking saw dust. The bag/jacket is not good for me. Light bulb would probably work, but electricity is not always available depending on where I park the trailer. Thanks, Keep em coming. Lots of info to add to my toolbox.