I like using multiple methods of heating. One thing I was looking at when I was looking at a Sportsmobile build was having multiple heat sources, from having heating ducts from the engine, to the Truma combination furnace/water heater, to an A/C with a 6000 BTU heat strip, finally to two Vornado space heaters (one inside, one on a GFCI plug positioned underneath the van to blow warm air on the tanks if on shore power.) This way, I can use propane, shore power, generator power, the vehicle's engine, or any combo to keep the van warm.
