Yes jerseyjim, I did use the brakes when needed, as I said before, I have travelled a lot of miles on I40,through NC and TENN, also I77 in WV,NC. Whenever I am going down steep grades I always use the tow/haul or overdrive, I guess it was overdrive on the 99 chieftain, and I would drop it into a lower gear if I wanted to slow down more.
Every year before we left Florida to come back to Canada, it was always at a Ford Truck center and the brakes were always checked but they always told me they were ok. Even when I traded it in this past summer, it was checked by the dealership and they saw no issues.
I always drove it at around 55/mph or 90/kph , geared down when coming to stop signs and off rams. It does make a difference on wear and tear on the braking system.