Not a chance in hell that I would let my wife drive my motor home on the "million dollar highway." Shit i don't even let her roll it out of the driveway.
Funny story... Back when I was 19, went on a road trip with the fam. Drove thousands of mile from SA to the grand canyon, north to Montana, further north into the the Canadian Rockies and then back down through the Montana plains, Wyoming, Colorado, and New Mexico. All in a 31 ft Class C. I drove ALL of those +/- 7000 miles. Driving through many mountain passes, I ignored signs such as "vehicles over 24 ft not permitted." Never had an issue, until the road up to Takakkaw Falls in Yoho. On one of the last switchbacks towards the top, my vehicle was too long and couldn't make the curve. I had to white knuckle reverse that beast back down the mountain. Tied up traffic. Had countless tourists flip me off and/or yell obscenities. My ex-wife was so fucking scared, she actually got out and walked a good portion of the ordeal. Took me almost three hours. Moral of the story is; don't ignore the warning signs....