Thanks to everyone for the timely and useful advice!!! I've downloaded the Mountain Guide and am looking at milebymile, Trip Wizard, and more closely at Google Maps. All these help.
To answer some questions... I've been afraid of heights all my life though until now I've managed it pretty well. Like bigjim, my fear seems to be growing with age. I only bought my 38 foot class A motorhome a few months ago. It's the first vehicle I've owned bigger than a car and this is our first big trip. We don't have any towing gear yet so my wife is following me in the SUV.
Stupidly, I pl