We have traveled to Arizona from Wisconsin for 10 years now in December. We watch the weather but generally don't have many problems as we take I80 to I35 in Des Moines to head south. At Wichita we decide whether we continue on I35 to I40 or take hwy 400 (54) to Tucumcari NM and pick up I40 to Flagstaff then I17 south. Watch the weather in Flagstaff as they can get some nasty snowstorms. One advantage of a MH is you can hole up and wait until roads are safe to travel. Myself I wont't travel when the road become risky. Just isn't worth the risk in my opinion.
