Some hitch brand owners seem to think their brand of hitches , not just B-M, can't be hi pinned or dropped. BS.
Even the commercial types using SAF-Holland hitches (example)can be hi pinned/dropped. Under the right circumstances any brand hitch can be hi pinned or dropped.
Another safety device that can eliminate damage to the truck and trailer for what ever reason a trailer has dropped;
http://www.5thwheellatchkit.com/