My F150 did great towing my 8800lb fifth wheel trailer until I go into the hills of SW Virginia.
Going up the hills was just find but coming on the other side was white knuckle all the way...
Another point for TT trailers if you are near maxed out or just over maxed out is when you get swamped by an oncoming major load tractor trailer pulling a load of cut down trees for GEORGIA PACIFIC wood company on a two lane highway in East Arkansas on US82. The "swamped out" affected the travel trailer big time and I almost lost control of that... Another white knuckle situation.
I probably just chickened out in towing procedures as I know this is something you almost have to grow up doing like riding a motorcycle. You already know what to expect I guess and it doesn't bother you maybe...
I have ZERO problems now with my large and heavy OFF-ROAD POPUP trailer with my F150 truck. Gets great gas mileage when I am towing because of NO WIND RESISTANCE and my F150 doesn't even know it is back there. Me happy camper now...