You could definitely tow the Ford EV on a trailer - but I'm sure you knew that already
And it will likely be a little heavy for this, compared of course to a Honda Civic or other car that is typically towed behind an RV.
You could probably get away with a dolly that raises the front wheels off of the ground and just drags the tail of the Focus. Assuming the Ford Focus Electric is similar to the Nissan Leaf though, you'd still have the 4 wheel parking brake to worry about. It's a brake that applies to all 4 wheels, so you'd have to have the transmission in neutral, and there's some debate in the Leaf forums about whether or not you'd actually have to have the car 'on' in order to release the parking brake. And if you can work around any parking brake feature, you still have plastic low hanging body panels to worry about. Most low modern cars can't be towed the traditional way because of the low hanging plastic body parts.
Even if Ford says a 4 wheel flat tow was safe on the Focus EV (which I guess is highly unlikely as the Honda Insight, Toyota Prius, Chevy Volt etc all highly recommend against flat towing), you still have to worry about the gearbox getting the proper lube, and I assume just to be safe Ford will say no.