My wife and I just got back from a 6000 miles trip through the eastern U.S. with our F150 EB, full trailer package, 7350 GVWR package, and select shift tranny. I loved the truck on this trip. We were pulling a lightweight trailer and didn't really need everything this truck had to offer but it sure made for a great trip.
I made frequent use of the selective tranny and rarely had to use my brakes on the descents.
I had the opportunity to test out the total braking capabilities of my rig when someone swerved in front of me and stomped hard on the brakes when there was no reason to. Their top brake light and right hand brake light did not work at all and the left light lens was broken and covered with multiple layers of colored plastic tap covering the lens. I believe that the guy was trying to collect on my insurance. Thankfully, my truck and trailer brakes were up to the task.