Take it from me, I towed a 7k TT for three summers with my 2011 screw ecoboost - worked fantastic with that size of TT. We upgraded to a similar size and weight to your unit and found that while the ecoboost provided all kinds of pulling power, the F150 chassis was simply too soft and light duty. I towed that TT around 2000km's with it and decided the only safe and comfortable choice was to go the 3/4 ton route.
My honest, well informed and experienced opinion in the matter is that the Ecoboost F150 won't cut it with your existing TT. Been there, done that and have the shirt.
Feel free to pm me any direct ecoboost heavy towing questions you may have.
Alex.
