Something to consider will be what you use the generator for - just to charge the battery while dry camping, or to actually run the AC while camping other than in the mountains of Colorado? I've found few times in several years of camping (with a popup and TM) when I actually
needed the AC. I've turned it on a few times just to be sure it works!
Most of the places we camp have at least electrical hookups so have not had to deal with the battery much.
I did get your PM. I'll respond when I get home (had a little free time at work and just checked the forum.)