Phoenix to Mid-Michigan

We are home from the trip and want to do it again in reverse when we can spend more time and have the towed with us so we can enjoy some of the sights. It was a great trip, we took 3 full days and 2 half days to get home. When we left Phoenix it was 104 and we managed the climb to Flagstaff without any problems. We did stop in Amarillo on our 2nd night - thank you for the suggestion - and enjoyed the long horn limo which took us to and from our campground to the Big Texan. If you are ever in Amarillo that is one stop your need to make for dinner and some fun entertainment. No problems on the trip other than an driver's side window wiper that decided to have a mind of it's own and a leaky toilet - nothing that can't be taken care of. Thanks everyone for your advice and suggestions.