Air circulation is the key - when talking winter (cold) condensing. Anyone who lives North during the winter can tell you if they have good or poor air/heat circulation by the amount of water/condensation on their windows.
We bought a timber frame home that had only wood stove heat. When we looked at it the huge windows were soping wet. Our first purchase was a forced air furnace - with the circulated heat the windows are now dry.
Another observation - wood - we try to keep our relative humidity around 40 if not then everyone get itchy dry skin. When it gets really cold our "humidifier" has to work overtime to fill the air with moisture - why? because all our wood timbers are sucking up all the moisture.
So for those units in storage or cold winter camping - open up all the cupboards to expose the wood undersides they will soak it up. For those who do not have wood - line your closets with cedar, Or place chunks of porus wood around the trailer. Along ewe and dwightdi' ideas for circulating air and heavy duty summer humidity (use of a dehumidifier) should do the trick.
You only need a slight difference in temperature to stick to the walls in winter - or create ice crystals with your breath. Try overnighting when it is -21C outside -17C inside with two big dogs and two humans in one small GT Bedroom - talk about moisture and almost freeze to death. Now we have a buddy heater for this trip and a 12 volt