There are basically two types of dehumidification: heated and chemical. Heated would, obviously, ad heat in your RV. Chemical will remove the humidity with no additional heat (that you would ever notice).
I plan to use chemical dehumidification, probably Damp-Rid in a bucket that I simply toss in the trash, or find a way to make my own bucket to use a bulk sized bag of dehumidification crystals. Something I can put a lid on when in motion, and maybe put that into an additional container to contain any spills Justin Case.
http://www.damprid.com/product/4-lb....sture-absorber