You always have the option to keep the truck and sell it to someone else. Also in my experience dealers tend to be pretty lenient with wear and tear if you're buying another vehicle when turning that one in. Mileage seems to be the only thing they are really strict about.
My BMW dealer experience says otherwise regarding lease returns. But, since Ford doesn't offer a lease program on their specialty vehicles, it wouldn't be worth it to me to lease it from a bank. I'd rather buy it outright and own it.