I used to carry my HMS Kent (57" long) on the back of my BMW motorcycle.I made a stand to fit on the back rack so that it fit crossways to the bike. I then supported the model on the stand by using rubberised canvass upholstry webbing straps on the stand which the boat was alowed to move around on.( and not rigid)
Not only did the straps absorb the shocks of the bike they also allowed me to corner bends and the boat virtually leaned into the bends as well.
It worked well and never came to any grief, although I did get some strange looks. you just have to watch other road users and pedestrians, as they don't expect it?

How legal it was, I don't know, but I was never stopped by the ol' bill.
