Having had both a 2014 and now a 2017 F150 Ecoboost and having towed in Montana, South Dakota, Wyoming, and to Alaska I can offer what I have experienced. Like others have said, going uphill is no problem, power to spare. Going downhill is a matter keeping speed under control, start out going slow and having transmission in a lower gear. If you crest the hill at 60 mph the speed will quickly build on the downhill side and you might not be able to get things under control as the computer will not allow you to downshift to the lowest gears due to overspeeding the engine. Staying on the brakes all the way downhill is going to result in the brakes fading due to overheating. Start out slow going downhill and don't allow speed to build any faster than you are comfortable with. Not different than the 5.0 F150 I had.
