I just had my 08 R1200 GS adv transported from Wisconsin to Arkansas. Wolverine Transport was recommended to me by another BMW rider(yeah yeah, Work schedule prevented me from riding it down)
They picked up and dropped off with no problem at all. Transit time to Arkansas was 2 1/2 days.
All they do is motorcycles. Period.
They have two big cargo trailers circling the country. They have a custom strapping / ratcheting system on the floor that is completely adjustable inside so they can carry about 10 or twelve bikes at a time. The ramp on the back is the width of the trailer and is comparably low to the ground.
I was flexible in by timing. They initially provided a week window, then two days before gave me a heads up. That approach worked fine for me. The price was very good too.
Honorable mention for Bob at Bentonville BMW, they acted as my receive point and will watch after it until I get down there later.
I am not affiliated with Wolverine transport, just a satisfied customer
Just wanted to get the word out.