Two weeks ago we returned from a 12k mile, 30 day trip from OH to Prudhoe Bay, Homer, McCarthy, Dawson City, etc in our FWC Hawk. Knowing that condensation can be an issue, we kept all the windows opened slightly in one corner and the fan vent opened a bit. Most nights were around freezing, lowest was 27F. Furnace thermostat was kept near its minimum so inside temps were ~50F in the morning. We never had an objectionable amount of condensation, a quick wipe was the most that was needed. Bottom of mattress never got damp. IMO, you have to practice moisture management whenever humans are breathing in a confined space, no matter the brand of box. Even in a composite, insulated unit you may have condensation forming somewhere in the thermal break that you cant see and then hidden mold.