I live in Colorado and have seen several accidents due to overheated brakes.
Some easy tips that I use to keep things safe:
a. Tow haul switch on
b. Exhaust brake if equipped
c. Downshift 1-2 gears to increase engine braking
Increase engine load by:
a. A/C on even if it isn't hot on. This puts an 8-10 hp drag on engine
b. Increase electrical load on engine. The increased electrical load puts a load on the engine via alternator. I turn on all lights (parking, front, and fog), rear defroster, and even put the tush warmers on.
d. MOST IMPORTANT ***SNUB BRAKE**: Do not ride your brakes the entire way! This will cause them to overheat! Pick a comfortable speed and apply brakes when speed increases to 5mph faster than your desired speed and then apply brakes to about 5mph slower than set speed. Let go of brakes and repeat. With a/c on, car in lower gear, and high electrical load, you won't be speeding up as fast as you did before.
Lots of commercial drivers think that constant braking is the proper way to ride down a mountain. These keep the runaway hill maintainers employed. Constant braking is a myth especially when towing.
A good example of snub braking except I go 10 mph (5 above and snut to 5 below)