Fiver Pin Separated From Hitch on Interstate

If mechanical stuff couldn't, and didn't fail, I'd have never made the money to buy the toys. That said, I don't see any way the hitch could fail in such a way as to have locked jaws and the pin installed after trailer separation. With the B&W, a visual inspection should easily identify any miss hitched issues as I find it very easy to visually confirm the jaws are properly locked around the pin in the correct manner. Those who have done a high hitch are indicating it comes loose right away, and would be very unlikely to happen hundreds of miles down the road.

Hopefully, if this really happened as described, the OP will post a follow up when he gets the chance. As much as possible I try and learn from the misfortune of others when possible rather than learning it the hard way.