Just this morning at the local café, the conversation was about Volkswagen vehicles and one of the old timers (anyone older than me) told about building a wood fire in the floorboard on the passengers side to warm up the vehicle in the winter. I'm not sure if this is something he saw/did personally or more likely one of those I heard a guy that knew a guy ........
Just put down a good insulated layer on the floor and build your fire. Or I have a firepit that I use outside. I guess that with a window or two opened a bit, it could be used inside.
On the serious side, my sister burnt down her trailer (mobile home) when a log in the fireplace rolled out into the living room while she was stoking the fire.