I agree with most of the above replys. However, as one who two months ago did the the Cortez to Tellurice to Montrose to Gunnison to Salida trip, let me add one thought.
At the top of the "passes" or other steep grades, you WILL put the RV tranny in low gear and proceed down the hill at about 10mph (my exhaust brake would not hold the coach). If you do not do this, and you depend on your RV brakes, you WILL toast them in a heartbeat. And, depending on the brake disk's condition, they will either cool off and be OK, or they can crack and need to be replaced.