Jerry, Been through the Rockies many times with both a 5th wheel and Motorhome, both diesel. Descending is the issue. One rule of thumb is to do not descend in a higher gear than you need to go up. You've got plenty of time, no matter what the folks behind you may think. Just gear it down and maintain control. Only place where I have needed to get into 2nd gear was from Sheridan Wy to Cody Wy. Even thought about 1st gear for a time. Believe it was called Granite Pass. MUST have a brake controller and it's even required by law. Take your time and enjoy the trip.
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