From what I've seen, boondocking forays aren't usually limited by power or propane, or food for that matter. It's the tanks that get ya. And it's not the fresh water tank either. You can always bring extra Jerry cans. It's the grey/black tanks that force people back to civilization.
As for Lithium, I'm trying to rationalize the extra up-front cost. For roughly 3x the price of AGM you get longer life (I think I read 2-3x somewhere) . Because they discharge deeper you get roughly twice the usable amp hours, which translates into half the weight and space. On the downside, they can't handle really cold temperatures and they can't accept a charge below freezing, forcing you to store them inside the unit and maybe taking them out of the unit in the winter time. That can be a deal breaker in some areas.
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