I was told that the sub-frame is broken into two pieces on my 2002 Buick LeSabre. Is this something that can happen from excessive wear & tear, I deliver newspapers. My car was recently towed and damage was done. It seems the car was pulled sideways, creating a flat spot in a brand new tire, cracking the wheel in two places and damage to the wheel bearing was also done. Could this have caused stress on the sub-frame causing it to weaken and then break after some driving?