Scott,
Looking through the Bently, I see Canadian Vanagons were offered with
gasoline powered furnaces on timers that do just that.
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I very much like the idea of heating the coolant with house 110V and
circulating it via an electric pump ( either 110VAC or 12vdc ) and then
running a heater fan at low speed.
Do that for half an hour on a below freezing day and you could hop into a
vanagon with 60 degrees or so interior temp to start with, and defrosted
windshield, before you even start the engine or burn any gas.  ....