Group 31s are used in most semis, so there is a large and cost sensitive market. I also think more of the market are repeat customers like you, who keep detailed notes on performance, lifetime costs, and buy accordingly, unaffected by marketing.
You might try a battery blanket on your F-150, if it doesn't already have one. AGMs are generally more resistant to cold and vibration, but heat, and deep discharging them does eat into lifetimes. Is your engine able to charge the battery at idle? We've got one vehicle that I learned the hard way can't actually keep the lights on and charge the battery at idle. (Also a pricey little AGM replacement battery in an obscure group size.)
All the best,
Peter