Long Bed vs. Short Bed for Towing 5th Wheel???

I only tow 5th wheels. I went from a Chevy 2500 4 door short bed to a 3500 dually 4dr long bed and really can't tell any difference between the two bed sizes. A friend just got a short bed Dodge to pull his tow hauler and managed to turn tight enough for the trailer to strike his truck cab, not once but twice, in the same trip.