^ I bet if you had a South Dakota registered sideXside("motorcycle" size license plate) and DL nobody would say a thing. There's supposed to be some level of reciprocity between the states.
The TAT would be a cool trip, I know the passes through the Colorado on the "easy" route aren't that gnarly, 4x4 van or crazy guy in a 2wd territory, Ophir, Hurricane, Cimmaron and paved passes like Red Mountain and Lizard Head.
I would love to do some of the state BDR(Backcountry discovery routes) in the future, in fact I had planned on joining the COBDR at Gunnison and following it Northbound on this years route(Old Monarch instead of Cottonwood) in my 4wd civic but alas, the car is dead, rear diff seized luckily when I was near town..