We used wood burning stoves in our house as well as our hunting shack, (an ATCO trailer) and never had issues. Since the dawn of time men have used fire for heat, kinda funny how all of a sudden it's too dangerous. I'd bet that a few early settlers and such were bit by not respecting the power of fire, but with the proper design considerations you can heat a tent with a fire. NOT saying I would take a $50,000.00 trailer and heat it with cord wood, but I'm with Hank on this one, as long as he did it properly there should be no issues. With the proper chimney, the roof wouldn't even need that extensive of modifications to remain safe. After heating our home and camp with wood for years, I can tell you from experience that there are FAR more dangerous sparks and embers coming off that campfire than rolling out through a proper chimney.