Here's an option most bus converters never consider, but it's worked on boats for generations:http://www.marinestove.com/codinfo.htm
I realize that wood heat is not for everyone, but it works for us. We full time in a 40' Gillig H2000LF. Our stove is custom built steel, but we used a cast iron Little Cod for inspiration. About the same size fire box. Ours is more air tight. More on our installation can be found at this thread: http://www.nomadicista.com/viewtopic.php?f=4&t=2541&sid=47aa98a0c7f390eafe9ee59c7c15dc95
Propane works for us in some areas. Our Rheem tankless water heater is wonderful, and we would not consider cooking any way other than gas. Our Maytag Neptune dryer is propane, of course, but we seldom use it.
Propane does not work for us as a heat source. Forced air furnace fans would suck too much of our off-grid electric power, and radiant heaters are like giving the interior a constant water spray. Seriously considered going radiant floor heat with diesel or propane fired boiler, but energy use and maintenance issues held us back.
Even though we love our tiny wood stove, this winter we're also planning to use the ThermoKing Tripac auxiliary power unit I'm currently refurbishing. Not only available for supplemental heat in the back 1/3 of the bus (bed/bath/laundry), it will also keep the battery bank charged while it's running. By the time warm weather comes around, maybe I'll have the mechanical AC feature of the APU installed in our bed room. All from a tiny, two-cylinder Yanmar rated at 13.7 HP.
Our primary heat, however, will continue to be a wood stove.
P.S. I'm amused when people say they have an "all electric" coach. Almost without exception that means: "I have an enormous, diesel-fired generator in the belly of the beast." Nothing wrong with that approach if it works for you, but it's far from being "all electric."