Jeff, this looks like a worthy item but I do have one concern which you kind of addressed in your list of cautions. Since this heater does burn fuel and consumes oxygen, using it in an enclosed environment might be somewhat hazardous to one's health. The two examples of RVs you've used this in both have/had tenting material which is not as airtight. Hard sided trailers and TCs are definitely more sealed to outside air influence.
Am I being overly paranoid/cautious?