For heat my truck has a propane furnace. There is a 12volt blower motor and ducts run to a few different locations where they blow out the heat. It works very well, seems to be quite efficient, and only uses a small amt of 12v to run. Wouldn't something like that work best for the heat part?
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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