First, welcome to the forum and congratulations on your new-to-you Everest. I'm not sure how much dry camping you intend on doing or for how many days you will be without shore power. For 3-4 days, you should be able to get by with a single Group 27 battery with prudent use of anything that draws from it - lights, pump, etc.
You might want to consider two things if you are going to continue to dry camp:
1) switching out your present incandescent lights with LED's; and,
2) installing 2-6v batteries instead of a single or two 12v's. Again, not sure about how much room you have.
We have a sticky on LED lighting on the forum which can be found in the Modifications and Upgrades section. You might find this worthwhile reading.
Good luck and safe travels.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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