We have towed our 2013 28' International just over 8,000 miles with our 2013 F150 Ecoboost, Max Tow Package. No issues. Plenty of power. Braking good. Handled some poor situations (ice, snow, 50mph cross winds) very well. Example as recent as yesterday: 20140109 Arkansas ice - YouTube
I roll around at 70mph all day (at 8mpg). Stable.
I have a theoretical concern about payload. Theoretical because I am probably close to the max payload rating (about 1,700 lbs) but not noticeable - no sagging, etc.