That's part of the answer, but the other part is that towing is going to reduce range significantly regardless of your fuel. With a gas or diesel vehicle that's not a big deal, because you can fill back up in 5 minutes or less. With an EV, it takes 20+, and the fast charging locations are less plentiful than gas stations. If you're not towing, that doesn't matter too much, but when you have to charge 2-3 times as often due to towing, it becomes a real issue.