I currently tow a 30ft - 2011 open range roamer 303BHS (7100 dry) with a 2013 f150 ecoboost (previously a f150 v8)and we loved the design & floor plan as it was different than all the others at the ti...
The one thing I have found will effect sway is if the front of the TT is nose high at all. The higher it is the lower the speed at which it will start to sway. Just my experience.