I’m calling bullshit on that. Here’s an article from motortrend showing it has a towing range of just about 100 miles. I’ve seen that backed up by numerous other tests. motortrend.com/…/ford-f150-lightning-electric-tru…
I’ve seen references to the ICE getting 9-10 with a 23 gallon tank. That’s more than double the range with a refuel time being an order of magnitude faster.
Batteries in trailers would help. However now you have a battery to tow, which would still have an impact both because of stopping and going and the DOE estimates for each 100lbs extra weight in your vehicle, your MPGs gets a ~2% reduction. Additionally I would not recommend strapping a battery to a boat trailer unless you are sure it was waterproof. Even then it would make it sink into sand easier.