At the very least it was two different cars plus the other abortion of a kframe for that early abody. And thats the only ones posted on a forum. God only knows how many more failures they really had that you'll never know about.
Used or installed wrong? For real? What idiot thought that bs up? Your supposed to be able to spot bs and you missed that? Even if someone hit a huge curb at 60 mph the weld shouldn't break before the metal around it and that is a fact.