Our RW comes with one 12 volt battery which I think is the standard configuration. I am wondering if one 12 volt battery is enough? If you believe one 12 volt is not enough for the battery system, do you recommend 2- 12 volt batteries or 2- 6 volt batteries? Two 12 volt batteries are cheaper but I am told they will not last as long as two 6 volt batteries. I understand a two battery system may be overkill but my wife and I are new to this activity and we do not know exactly how we will be using the unit. Since we are avid backpackers my guess is we will not always be hooked up to land power. And, is the 7 year warranty worth the extra money? My guess is yes because the cost is a little over $300 per year and some of those appliances may cost that much to fix or replace. Thanks for your input.