In rather dry climates the wave seems to work ok in a trailer. If it is in a humid climate, it can push moisture buildup over the edge. For every gallon of propane you burn, you get almost 1 gallon of water in the air. No issue for vented heaters, but our experience in our trailer in oregon winter humidity is it pushed over the edge for humidity and condensation problems with the wave, even with windows cracked. But then outside air was near 100% RH also.
If your in a dry climate, then it may actually help getting the humidity up.