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Condensation needs 2 things, high humidity and temp differential. It must be cooler inside than out and the outside air must be fairly humid. I dont know if your problem is when the unit is stored or when you are camping. If its when stored you could just crack the vents if you have covers and run a fan or the one I prefer is to seal the unit up and use desiccant bags. They sell them for closets or you can get flower dry from a hobby store and put it in cloth bags. Every once in a while you need to pull them out and dry them in the oven. If that does not work you have a big air leak somewhere.
If it is when you are camping you will have to keep the vents open a little with a fan running. The average person looses over a litre of water per day just breathing. At night when the temps drop and surfaces get cold your breath condensates on everything. If you have several people inside it can be allot of water.
I dont know of any 12v dehumidifiers and the 120v type all blow out a lot of warm air. They work just like an air conditioner but they dont blow the hot air outside and the water is collected in a rear bucket that needs to be emptied if you dont have an outside drain.
I put an ultra quiet computer fan in one of my vents. It does not move enough air to really cool the unit like a fantastic fan does but it draws such low current that you could run it for months on 1 house battery so I leave it on almost all the time I am using the RV and it prevents the damp feeling you get when camping in cool weather. Of course if you boil water or run the shower you still need to use the larger fans.
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