Thanks for posting, as it helps everyone make up their own minds
That bushing crush is why have asked for the higher tongued trailers, so they have
a longer ball-shank?
Also, that is what happens to plastic springs that are compressed beyond their travel
rating. Coiled steel springs will just bottom out and no more travel ability.
Plastic or any compliant material springs will continue to be compressed till the material itself fails.
Some might go plastic and extrude themselves out, some might crack, some might
crumble, etc
The cool think about using a plastic spring is that it's stored kinetic energy
is released slowly. So the potential for the WD Hitch System 'bouncing' is much lower.