Welcome to the Airforums. You have certainly come to the right place. The batteries are set up in parallel. I would suggest having at least one in order to run the tongue jack, etc. Most of the light bulbs are standard automotive type (most are 1156) I would think the chances would be good that most work.
Make sure you have a weight distribution hitch, and a tow vehicle (TV) up to the job. We tow our 34' with a 2009 F150, but for the higher elevations in your area, I would want more torque than my truck can deliver (trubo/diesel comes to mind).
There are a couple of members of this forum who fall into the expert category living in the Denver surrounds. Please don't be afraid to ask questions. When we got ours, it didn't even have a manual so we asked some embarrassingly basic questions.
Welcome to Airstreaming!
Craig and Carol
1997 34' Excella 1000
1970 27' Overlander, International
2009 Ford F150 5.4L
ProPride hitch with 1400# bars
Past President Southeastern Camping Unit (12)