It's been a while since I posted anything here but I wanted to comment on the truck I have.
I have a 2015 Ford F150 SuperCab with the 2.7L EcoBoost V6 and it tows our 1998 25B Safari VERY well. It's really amazing how they get so much power out of a 2.7L engine.
The Ford replaced a 2010 GMC Sierra Crew Cab with the 5.3L V8 and the Ford tows MUCH better with about 2-3 MPG better fuel economy.
We've been through the mountains in North Carolina on I-40 and it has no problem at all pulling up Black Mountain which is a fairly steep climb. My only regret with the Ford is that I didn't get another Crew Cab - Live and learn -
Anyway, I like the truck, smooth ride and the truck and loaded trailer weigh about 750 pounds less than the Sierra & trailer combination.
One final thought - The Ford has a built in sway control that you need to turn off if you have a sway control hitch or they will fight each other.