I keep hearing about this trail and your post led me to do some quick research on it's actual path. It appears that I'm about 7 hours south of the east-t0-west trail. The "official" website lists this as a dual sport trail, any idea what portions of this trail is open to vehicles with 4 wheels?
I noticed that there is a "Shadow of the Rockies" trail that is listed on their website here:
http://www.transamtrail.com/shadow-of-the-rockies-trail/ This one got my blood pumping because on the rough draft graphic it appears to run right through my area! No confirmation on if the whole thing can be done with 4 wheels though... I may buy the GPS kit for this one and see what I can come up with!
Awesome video by the way! It looks like the east portion starts near my hometown in Tennessee, so this one is on the bucket list!