I've taken the MB about ten times now round trip from Chicago to Columbus.
I ALMOST picked up a used Pista out in Columbus but backed out when the site said that bicycles were not permitted....
But...the next time I took the MB from Chi to c-bus...a guy nods at the driver and throws his MKV in the bottom storage and jumps on the bus.
I really think if you call ahead, that you can get it approved. But you could always just try your luck.