This is always a fun topic, because everyone wants to believe that their tow rig is the best thing since sliced bread.
I had an F150 7700# payload package 5.4L, it towed my Airstream OK, it was a little slow in the Rockies, but once we were east of the Rockies that thing would go like skinned s()$. The thing I didn't like was the brakes, i never felt comfortable with the stopping power.
Perhaps Ford has addressed that on the newer F150s, I just know going to the Ram 3500 I felt a lot more comfortable with the Stopping power.
The down side of going to a one ton, DW says gee I guess we can have a bigger TT now.