Come on, the Ecoboost certainly doesn't have >800lb-ft like the diesels in the 250/2500s. It's an apples and oranges comparison.
But you don't need that for many trailers. I pull 7500# and the truck is loaded to the max (7500#) so totalling about 15,000# GCW. Absolutely no problem pulling. Been all over, the Rockies, the Appalachians. Strong winds in Saskatchewan. The engine does the job.
My limitations right now are more to do with tongue weight, Rear GAWR and Payload. This has nothing to do with what the EcoBoost can pull. It's about the rest of the F150. Getting the F150 HD payload option would raise many of these limits. As would getting a 250/2500.
The only other engine issue is Engine Braking. The Ecoboost doesn't have that much. It's only a 3.5L V6. And the tranny only has 6 gears. So it can get you up that steep hill, but coming down may not be as easy. I, for one, would appreciate another gear between first and second.