lithium batteries

Yes, and if you add up the lifetime costs Lithiums are beginning to get in the ball park of being cost effective if you dry camp a lot. They can be charged very fast and can be drawn down a whole bunch. There are companies making them so they only draw down to a safe level but leave enough left to start an engine.

That and they don't weigh squat. My 2 AGMs weight 65 lbs each.

There is one person I know of with lithiums in a View/Navion.