You could get an inexpensive inverter generator, use it to power a small electric heater (or heating pad?) near the battery. When the battery is up to temp plug the shore power into the generator to charge the battery. That might work. Costco has generator deals at times, Champion generators are affordable, and there are others.
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Bill
2011 Dodge Ram 1500 HEMI Quad Cab
2011 Jay Flight 26BH
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