Thanks to all who have responded to my queries thus far.
I realize there's a real firewood issue by using a wood stove (thanks Dutchman for the graphical fotos
).
The KATYDID is UL-approved for use in a traditional home or mobile home in the United States and Canada, and I would be extremely careful to ensure installation was top-notch and with safety first.
I also see the point of $5k for a stove buying a lot of propane...
Regarding the Big Buddy suggestion, I'll think further on this - the issue it presents (based on what I've read) is one of added moisture inside the RV - the beauty of the KATYDID/KIMBERLY is that it's a dry heat, and the oxygen source for combustion can be from the outside.
I'll also do some research on the diesel heater option.
Finally, our location for this winter RV full-time living adventure will be the Pacific Northwest - thus my comment that I don't expect prolonged deep-freeze periods.
Again, thanks all for your comments thus far. Greatly appreciate the feedback & suggestions.