I've seen the results of a big rig wrecker pulling a stuck on a construction worksite one ton drw truck with a loaded flatbed trailer/pintle hitch....twisted the trucks main frame rails at such a angle it destroyed the pickup bed and its subframe.
Some tow truck operators have enough experience in knowing how to pull a vehicle hooked to a heavy trailer safely without damaging to the truck or the trailer......and some don't as in the OP case.
I've seen SAF-Holland...Fontaine big rig 5th wheel hitch jaws/pins bent/destroyed and the whole hitch even torn from the trucks frame fails........bent 22.5" truck and trailer wheels in similar stuck (buried) circumstances when pulled at a steep angle with big rig tow truck winches.
Damage jaws in one picture doesn't indicate a high pin hook up but looks like side loading from winching forced them open just enough for the pin to come out....then slip of the jaws when the truck moved forward.
