As far as the headache rack goes I'm thinking it is from the side rails it chewed up and threw, the pto.was still engaged and tension was on the bridle when truck was hit , as trailer went down the side of truck and hit car bridle did come off and I'm guessing the back lash caused this to bird nest , I as the operator just stepped back in the truck when I was hit, so moral of the story is im not really concerned about why this and why that but I am very grateful to the lord above that he had Angel's working overtime to protect me and my customers from having any major injuries!