Are you talking about a standard cab or crew cab long bed? We have an F350 crew cab with long bed. Used it to pull a 30' fifth wheel. It towed great, but the length was restrictive in respect to finding campsites long enough. A 30' TT would be quite a bit longer. I'd say stay with a short bed and get a canopy.
This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.