Thank you everyone for the advice! When we picked up our new hybrid I had them parallel wire an additional battery. We also took the plunge and bought a Hyundai 2000 inverter generator. Couldn't see spending a grand on the Honda as the Hyundai was on $540 on Amazon. Read the reviews and for the price it looks like a great buy. With both batteries we should be ok running the furnace if necessary and be able to charge with genny during the day. The only downfall is that the genny only has a 20 amp outlet. If I use an adapter and plug the 30 amp shore power to the genny will that be sufficient to charge the batteries? Not sure how that works never using a genny.