I towed our Feather 23BHM with a 2016 5.0. Feather is 5151 empty, maybe 5700 going down the road. Power was fine, plenty of payload, but the rear end was a little soft. No sway but lots of porpoising. I traded it last summer on a 2017 f350 6.2 (took a warm bath on that). We made the mistake of looking at fifth wheels and just jumped to one yesterday, so the 350 is needed now. I really wouldn't have been comfortable with anything heavier than the Jay Feather behind the f150 but everyone is different.
2017 f350, 6.2, SRW, Crew Cab, long bed
Jay Feather 23BHM