Looking at that plate the adjustable hitch is mounted on personally I would have two "D rings welded to it so if anything on the bolted hitch failed the chains would be connected directly but separately to the vehicle. My suspicion is the previous user was using the top pin that is not holding any weight as a tie in point. When ever I build plates on the rear of dump trucks I weld 1/2" or 5/8" "D" rings on either side of the pintle hitch towards the bottom edge and outside (Depends on trailer weight to be hauled.). I put the electrical plug up high on one side, air line connections near the electrical and the hydraulic connection on the top opposite side to keep the drips off everything during the connection or disconnection process.
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