I have only dry camped twice, so not a lot of experience with it, but I would suggest a small portable generator if at all possible, or at a minimum, get a second battery installed.
Lights, water pumps and other electrical functions can drain the single battery over the coarse of a couple days. With two batteries you will have a good supply. Remember to place a trickle charger on the batteries in the days leading up to your trip.
A generator is very nice to have for many reasons, and many are available that are light weight, pretty quiet and can power your unit on a couple gals of fuel. I purchased a 120/240 volt 3500 Watt Champion generator that has RV hook-ups. It serves dual duty of RV use and back up power for the house. It is not as quiet as a smaller Honda or Subaru generators are, but I figured having 240V would be a benefit. For RV use I am saving up to get a Honda. They are a bit more expensive, but are very small and very quiet.
Hope this helps, good luck!!
2006 Nissan Xterra
B&M Trans Cooler
2011 Nomad 206
Panasonic/Pioneer/Kicker ~ Audio/Video System
Days Camped /2009 / 33