I agree with above. Time for new plans. If you had a sense of adventure, experience at RV'ing, and plenty of time to ride out bad weather it would be ok. But held to a specific 5 day window I would not try it.
I was in Phoenix a number of years ago in early December on a 2 week trip for work. Planned a trip to the canyon on Saturday, but it snowed 19" on Friday in Flagstaff. But Saturday was clear and assuming they had plowed the roads I headed to the canyon on Sunday. Mistake. Roads as I neared Flag were treacherous to say the least, even in a car. You would possibly encounter similar conditions any where along the route.
