A few years back a couple of our members here: MrArn, his daughter and F6Banger made the trip from border to border, Mexico to Canada. I'm sure a search could bring up the details. I believe MrArn also maintained a daily blog during the trip.
Also a few years back the AZ and SoCal Valk riders let me join them on a good piece of 191, a good group outing for sure. I've taken it a few times on the bike and a couple cage trips.
Back in November 2004, my son & I were headed out in the old Monte Carlo to my make my daughter's wedding in Vegas and had a late evening start coming from Alamosa CO. Taking some of the non-main highway's, son driving, I awake to hear my son say "I think I may have made a wrong turn". We travel along a bit and finally see the highway sign
666 and I tell him in a solemn voice, "no son, it's all finally catching up to us, we're on the right road..."

We finally connected with I-40 and hightailed it toward Vegas with the unplanned side trip thru the Hoover Dam.