George -
Wow! When did they install mountain ranges between Tucson and Phoenix?
Seriously, I'm glad the towing went well. Next, try I-17 from Phoenix to Flagstaff, and let us know how the section through the Verde Valley around Camp Verde goes. Your Avalanche should do well there, too, but this section is a better test of upgrade towing performance and downgrade braking at mid-altitudes (7K ft).
None of these Interstate experiences tells us anything about the need for a WDH, of course
Bill
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