Lots of old threads on heating/cooling options and lots of opinions, you might read a few. I don't think their is such thing as a "best option" since they all involve compromise and depend mostly on the use mode. Mostly above 42 and hooked to shore power? A/C - Heat pumps are fantastic. Far and away the most efficient and dual purpose. When its colder than 40, consider small portable electric heaters. They conserve the expensive propane, just pack them away when you don't need them, though consideration to keeping the belly tanks a bit warm may need to be addressed. Disconnected? then it has to be propane and/or a generator. Your hot water floor idea will work if your heart is set on it. Run the pipe/tubing by the belly tanks too. If you do this, I'd go with closed cell spray on foam for under the floor since these aluminum cans tend to leak and the floors tend to get spilled on. Perhaps there are threads about insulation also, you may want to search for that too. Or go with the tried and true duct-ed propane furnace, and send a little warmth down to the belly tanks.
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