I just learned of a museum, lots of cars and motorbikes, it's in Murdo, on I90 1/2 way across South Dakota

Here is the inventory from 2011, it's not 100% accurate, but close enough to let you know what you can expect to find, you can get a look at them at http://www.pioneerautoshow.com/tour-cars.php

See a gallery of it at http://carzhunt.blogspot.com/2016/02/six-days-on-road-day-2-part-2.html

and they have a 1948 Nash towtruck