Thank you Guys,
Must say, a divided group, but a lot of option for me to consider, a great input folks, kind of familiar I10 and Tucson, years back our daughter went to UOA, so there were many trips, the problem always was the darn sand storms,and there are truly "wide open spaces" so kind of leaning toward I40 and I20. Last fall we drove to Denver, I15 to I70, Vail pass and Eisenhower tunnel very tough for MH and pull, but our Winnebago take us thru, slowly but we made it OK, all depends on the weather, will keep you post-it and ask for advise in case I am lost (it comes very easy for me, you know)