[Rusty]

I have read where a 5er did come disconnected from the TV and it came to a rather quick stop, although it happened while turning in an intersection at a slow speed.

I would think that it may skate on the landing gear pads as they do rock back and forth and they are also curled up on the forward and trailing edges. Although the trailer would land on the box. You can get a catch mechanism that sits behind the hitch and will "catch" the pin in case a disconnect happens.