If you have hookups, run a dehumidifier! Many full time rvers have one and use it. Hang wet towels outside to dry, use a squeegee to dry the shower after use.
You can also purchase small Damp Rid containers to put in closets or enclosed areas to absorb the moisture. They work very well (not in an open room area) We have double pane windows and the bedroom windows where we are at night, and the windshield (single pane) have condensation, the others not much unless I boil something while cooking. I try to avoid that when it's really cold out.