Quote Originally Posted by etlsport View Post
... would focus all of the energy of the crash on your gas tank or rear frame (it's been so long I forget what is behind the hitch)
The fuel tank shield would take the first impact but that's pretty thin. The fuel tank would probably get punctured if the hitch pin fails if hit from the rear on the SuperBumper (that's why I cut about 1/2 inch off of mine).

The other concern I would have is that if the internal threaded spacer were to get deformed, it'd be a real BEEEEOTCH to remove.

I'm leaning more towards the external clip ring approach with the pin being made as short as possible. Sue may have trouble getting even that to engage properly considering the angle it would have to be at during insertion.