I remember almost all flatbed being held on by U bolts, but I can't remember seeing any dump bodies that were.
How did the U bolts go over the lower lift frame and still allow the upper frame to come down flat when it lowers?
Also, I mis-spoke about the number of bolts I was thinking about the hinges on the lift frames. The actual attachment from lower lift frame to truck frame is only 1 or 2 on each corner.
