Jim Bob agrees with all relative to over kill for existing heat system as designed, in that no problem keeping bedroom warm, somewhat of a problem keeping rest of coach warm.
Our solution is two small ceramic type heaters, one in bedroom and one in the center of the coach, and they seem to do the job fairly well, as TC said, without sucking up propane.
On coldest mornings, we may fire up the coach heating system to take the "edge" off, but rely on small heaters otherwise. They go underneath or in the closet under the bedroom tv otherwise.
BTW, we are in St Augustine, love to have you drop anchor if you are close by......
Jim Bob
08 super nova 6362
08 Malibu Toad
Currently in winter quarters, St Augustine Fl.
http://jimbobmissbetteandbuster.blogspot.com