Comparing notes here, Bondage ...
By my count we're at 13 confirmed trucks. That doesn't include JeffB's friend with the question mark by his name. I also have two ? names on my list (friends of friends) that I think are coming but I don't have their direct confirmation. I'll chase them down with that in mind.
--------
If you're at all interested in the history of the wild west and the important role the Mojave Road has played over the centuries, $20 is well spent on
Dennis Casebier's book. It's an outstanding guide to the area and includes maps and extensive trail notes.