Jfresh,
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For me at least not running the furnace at night is not an option. I have a cold wife and the of the main reasons for the TC was to keep her happy. The wave heater, etc are great ideas but Personally I don't want more stuff and I think if you buy a TC with a heater it should be efficient enough it make it through a couple of nights.
Mine too, but it's got nothing to to do with the outside temp. :B
The truck charging system while driving is inadequate due to the awg size of the wire. Several threads here on the Forum discussing that.
Sounds like you have a way to go. Measure the battery compartment & get the biggest that will fit. The more amps, the better.