Guessing you could sit next to the truck for 10 - 15 minutes and try to spy on the dash.
Not unusual to have bad batteries. Early production had a few reported. Batteries are a pain as failure of all types is common. My boat has four batteries Make it a pain times four.
There also may be other issues. Some past reported were related to air suspension turning on and off, seemingly at will. Then there's loose grounds and faulty electrical connectors and loose or corroded connections and ...
Try an indépendant battery shop and see what their tests show.