http://www.youtube.com/watch?feature=player_embedded&v=7dypVgSEQ_Y 
That brings back some memories, did the same myself once with a bulk tipper. I wasn’t wearing a seat belt which resulted in my back using the n/s mirror as a skateboard as the vehicle was sliding along the hard shoulder. J5 M2.
Was on here a while back that video, said at the time, the unit looked like my old Roadways MAN / ERF unit