About the only way to get rid some of the moisture is to let it out! Keep your roof vent open a little bit...perhaps crack a window etc. Try keeping wet laundry outside. Use the stove hood vent when cooking. Perhaps keeping the coach a little cooler 68-70 might help. Condensation can be an issue especially with single pained windows and cold weather.
You could purchase a dehumidifier if the problem gets really bad.