Ron, Even if it were caused by a pivot projection hitch, the receiver should not have failed. I think that is the point that Ben is making. Besides that, there have been MANY other posts about failures and bending of the GM hitch of certain years by using standard WD hitches, as I'm sure you are aware of. I am not aware of other makes of hitches failing like those years GM hitches did - regardless of type of WD hitch used. Renojack asked about where the claim came from about GM round tube hitches, and Ben answered him very well in my opinion.
Barney