Getting another vehicle is expensive, no matter what fuel mileage it gets. It just doesn't work out financially. Not sure you'd like the EB with towing that much weight, and its not the powertrain that makes the difference. The EB can pull that trailer all day long. It just isn't a heavy enough truck for that trailer. Mines a lot lighter, and I just got back from a trip from NW Ohio to the Grand Canyon last month. Towing through Kansas on the way out and New Mexico/Oklahoma on the way back was White Knuckle Time with that crosswind blowing me all over the place. I'll never do that again with a F-150 / travel trailer combo. In the Rockies and in the flatlands with no crosswind, it performed very well.
My suggestion is to look at a newer SuperDuty with the 6.7, and get rid of your current truck. That's a wonderful engine with much better fuel economy than the orphaned 6.4. It might take a while to find a decent used one, but they'll be out there.
