[JRTJH]

^^ 2 Crack the vent open about 1/2" and open a window on the opposite end of the trailer. That will allow airflow through the rig and allow moisture to escape through the vent. You might also check behind the cushions on your dinette and the mattress on the beds where they are in contact with an outside wall. Chances are there's also moisture collecting in those areas. Be sure to pull all the cushions away from the outside walls so they can dry after you use the trailer in cooler weather where you see condensation forming on the windows and vents.