Welcome, you're about to get lots of info here.
My own take - With no electricity, treat your r-pod this time of year as a big tent, the weather looks like it is moderating out east for the next 10 days or so. Blankets or sleeping bags for the nite, the heater is great but you won't really need it. Head lamps work really good to minimize battery use, even for reading at nite. With a full battery, I have no trouble with 3 nights, but I am very careful with electricity use and don't ever use the tv. Also, "Deep cycle" batteries are much more forgiving in recovering from low charges than car batteries.
If you have 'shore power" (an electric hook up) things really get easy but it sounds like you are boondocking. I am sure you'll enjoy your trip.