I use one in my pop-up tent camper...which is like a canvas tent.
I found that I get condensation in there when I'm in there anyway, and when I can turn it on high for a little while and ventilate it the condensation goes down. I also found that I go through too many of the small propane tanks, so I bring the 20lb tanks and the hose attachments. The tank needs to be outside the camper for safety, but also saves a little space.
It warms us well, its quiet, and I've never had any malfunctions with it. So far I haven't died of carbon monoxide poisioning.