Your best bet would probably be a forum member, maybe one with multiple maxes. Maybe one that would tag along with you, for the whole trip or part thereof.
In any case, regardless of what you ride, you would most likely have a few forum members join up with you, since there are probably many living close to the old rt. 66.
Is your trip in the preliminary planning stages?
Please keep us informed. I think I will be heading out west next summer, it would be groovy to hook up with you somewhere along the way.
Cheers!