Sounds like fun. I'm looking forward to the upcoming pictures. Living at sea level (7') I have trouble with elevation starting at 4000'. It would take me a day or so to get used to the elevation you are heading for.
I've been hearing good things about the BattleBorn lithium batteries that seem popular with RV and truck campers.
Enjoy the trip.
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Don't believe everything you read on the internet- George Washington.