I guess we'll just have to agree to disagree. (I too am a professional driver with more than 1 million incident free miles, log books too prove it). F150's don't have jake brakes and very littlle engine braking no matter what gear you descend a hill with that kind of load, that leaves service brakes the hotter they get the less effective they are. There are just too mant things that can go wrong with electric brakes, blown fuses, chaffed wires, bad brake controllers to name a few. I used to tow with an F150, now use a Dodge diesel.