There is no red line on my 2014 tach as well. I was under the mh yesterday looking around and one thing I noticed that wasn't on the 1999 is that on the 2 front brake rotors Ford has installed some air ducts that scoop the air from the grill area onto the rotors. Nice to see that for cooling.
I also have travelled a lot of times on I40 and I77 lots of steep hills and never had a problem, just let the engine do most of the braking on the down side, and after 15 years and 178,000 Kms, the unit still had the original pads, and rotors, also I must add that every year before staring out for the new season the motor home was always into the local Ford truck center and 2 things I always wanted checked were the brakes and wheel bearings. I always needed that peace of mind when travelling.