I remember the posts back when you were in the planning stage and thinking I could never do 1200 miles a day. My trip down down here to Phoenix from Chicago was just opposite and probably the most enjoyable trip I have ever taken although not even in the same ballpark as yours. I only had one day over 500 miles (611) and took 3 1/2 days to get here. I met several other riders and rode for a ways with some. I was kind of amazed at the number of older people touring the country on Goldwings. I met a guy in Las Cruces, NM in his 70's that had a big bushy beard with a 1500 and a sidecar and his dog rode with him in the sidecar. The only thing I would have done different is I would have left earlier. I came down in late October and had to go down through Alamagordo because of the cold in Flagstaff.
Glad you made it safe, even if it wasn't enjoyable.