Go Super Duty! 11,000 lbs is right at the limit of a "properly equipped" F150. Hell 11,000lbs is a load for a F-250. Make no mistake, 11,000lbs is alot! Get yourself some Leway with bigger brakes and drivetrain, go with a superduty!
I just saw you already have a F-350. What is your reason for wanting an F-150? (not bad mouthing, I loved my 150)