Keith,
I think you will find the stiffener plate was almost exclusively put on tippers because the hoist acted upon the unsupported section of the chassis between the axles. I don't think the fitting of a winch was cause for the stiffener as they react horizontally.
The blitz in your picture probably was a tipper at some time. It is hard to tell if the Chev is a tipper or not but the "U" clamps only go around the stiffener plate and the chassis, not up around the body channels leaving the body free to move, supporting a tipper identification for the truck.
Lang
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