Oxygen..
Using Mr Heater does use some oxgen, however the TM is far from air tight. There is more then enough air coming into the trailer to compensate for the oxyen burned off. A propane lantern will burn far more oxygen then the heater. I believe the rule is "one small window open 1/2 inch. But it is up to the users, what ever they're comfortable with.
Condensation: For some reason it has never been a major problem for me, I don't know why. I had a 5th wheel once & it was a major consern.
Have fun...........
Jack
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