Thanks for the replies everyone. I'm still early in the planning stages for this one, but I think we'll be in a hurry to get from Williams to Cortez, so no stops along the way.
We're taking some friends who are new to RVing - they recently rented and RV and went on a short trip with us here in CA, and now they want to venture out further. But because of their schedule, we'll be limited to 2 weeks, rather than our normal 4 week trips. So we'll have to pick and choose where we stop in order to complete the loop in 2 weeks.