Actually, it was a conversation with Lifeline AGM tech support that got me on this after 8 years. He said a continuous 14.4 V after their AGM batteries were fully charged would cause them to fail, and yes, they could tell that if you tried to warranty them.
I currently have Crown CR-235 flooded cell I can buy for less than half the LifeLine cost. I’m 78 and mostly boondocks camp.
Sansa - thanks for response! What year is your rig? I’m wondering if Ford had different voltage alternators over the years.
Anyone else?