[hcvone]

My second battery setup is straight from the Tahoe police truck, I installed two batteries for several different reasons, one is for towing our trailer, many times I have to park it on the streets and need to leave the marker/parking lights on for long periods of time while clearing snow or stopping to eat somewhere, or it's snowing and I leave the lights on for safety. Another reason is starting in real cold weather, at our home in upstate NY I have seen temps to -25 degrees many times and -40 plus is possible, although I have engine block heaters the weather kills batteries.