On AZ89 from Wilhoit to Prescott is the worst stretch. We drove it a few months ago in the pickup, not the coach, on a day-trip from the Pleasant Harbor RV Resort. Going up the hill just barely out of Wilhoit, if memory serves me, there is a sign saying no vehicles over 40 feet allowed. There are miles and miles of 10 mph and almost 150 degree corners with few places to turn out off the road for anything but a car, cycle, or pickup. We passed a few bicycle riders but most of the traffic seemed to be fast little cars and faster yet motorcycles. Even in my pickup I held up traffic and had to pull out six or eight times to let groups of four and five vehicles pass.
Obviously it can be done in a coach, but I would not take my coach through there after having seen it.
