[AZ Traveler]

Jester,

If all is working properly your truck will recharge your batteries while driving but at a slow rate.

The heater blower motor is a power hog so if you have a single small battery and the heater was running constantly it won't last long. If you are going to boondock a battery bank of 2 or 4 golf cart batteries gives you a lot more reserve. A battery monitor system is low cost and will give you a much better indication of your battery bank state than the simply lights.