No, most farmers don't have solar panels. But nevermind free fuel, they have practical work to do. Most farmers are using diesel F350 or similar class pickups because they need 20K to 30K pounds of towing capacity. The F150 lightning or regular gasoline F150 even cannot compete with a diesel engine for doing work.
Farming must be extremely different in America. Here in New Zealand, where agriculture is our primary industry, those massive trucks are extremely rare. The biggest selling cars for farmers are, by a massive margin, the Ford Ranger and the Toyota Hilux.
On our farm we pulled trailers containing hay, trash, or a couple of farm animals. Most other stuff (like bags of feed or fertilizer) fit in the bed and didn't need a trailer. A plain 1/2 ton truck is perfectly fine for this kind of work.
As I said, "in my experience". Which is Saskatchewan, where a typical rural family farm is 5000 acres. That's too small to support any employees.
And yes, they use light duty trucks to haul trailers for chores, but those are 5-10,000 pound utility trailers with a bumper mount hitch, not the 20-30,000 pounders with a (presumed) goose neck hitch like you're talking about.
I think you're wrong about this. I grew up on a farm and most of our daily truck trips were 50 miles or less. Given the awesome towing capacity of this beast and roughly 1/4 the cost of fuel per mile, we'd have bought an F-150 Lightning in a heartbeat.
I have no illusions about pulling RV trailers with an EV. I know about the range hit trailers cause.
But for utility trailer towing for short trips (which is what my comment was about) that's irrelevant. I haul utility trailers with my Model Y all the time. Range doesn't matter because they're all short trips.
I dunno; a farm-use electric with range for a day or two of work plus a trip to town is probably a slam dunk for many working farmers, especially with the other electric benefits.
This seems aimed at suburban buyers instead of farmers to me.