Only place I ever see Bay & Bay trucks are in route from the cities to the northeast.(see them on I-80 in PA alot)
MCT(Sioux Falls,SD) runs an upper midwest regional and has a yerd in the cities. Shuster(sp?) out of Lake Mills,IA, H.O.Wolding, Decker truck lines out of Ft Dodge,IA,Midnite Express out of Fargo,ND , Wiest out of Jamestown,ND and several others that I can't think of right now, all run heavy in the upper midwest.