I seriously doubt I'll ever need the AC in Sequoia. The campground is at 6700'. The AC requirement is for DW when we camp at Bluegrass shows down in the flats.
As far as generator hours, at National parks they are normally pretty lenient, so I don't think that will be an issue.
As far as my battery, it's BIG! A 4D weighs about 140 pounds and is over 200 amp hours. There is also an independent SEC smart charger that is attached to it that will charge it pretty quickly.
If it weren't for the DW I wouldn't even be considering a 3kw.