>That truck would sell gangbusters.
Nope.
Live in Texas, where there are plenty of people with top level F150s, Raptors, 250s, 350s and so on. Ive seen maybe like 5 Lightnings total since they came out, despite them being the same price. Full size trucks is a different market.
Car frame Trucks like Rivian or Maveric make sense because they are trucks for car people that like the idea of a truck. People don't really carry much in those trucks, and don't really drive that much.
With full size trucks, outside the negligible market that buys them for the size factor, people buy them because the utility value goes through the roof. Quite a lot of people who use the trucks end up putting a lot of miles on them, or using them for carrying lots of stuff (and there is a difference between full size truck bed size and even mid size like Tacoma, namely with what you can carry with tailgate up a and also the depth of bed to prevent things from falling out).
EV in fullsize truck doesn't work that well because a) aero drag is insane, so you are limited in how fast you can go for any real range, and b) any extra battery weight takes away from total payload capacity.
So long as XLT is available (which makes up for 33% of the sales) and gas stations are a thing, you are never going to compete with any equivalent EV.
The easiest thing for Ford to do is make a good plug in hybrid. They already have the hybrid F150 (although reliability issues are still there), but the thing can power your house in power outage, and go like 600+ miles on a tank of gas. Just give it a bigger battery and make it plugin, and pair it with the tried and true 3.5 ecoboost, and you have a winning combo, and people will pay $70k for that thing.