Using propane heater exhaust as a outside heat source?

I already use the exhaust heat in cold weather. When setting up or breaking camp, I use it as a hand warmer. I just have to be careful not to get my gloves too close the vent, because the back pressure shuts down the furnace.

Seriously, I think the exhaust gases would not be safe to circulate anywhere in or under an RV. You would have to build some sort of heat exchanger to be safe.