Here's some better lighting.
These are E-load Michelin LTX, inflated to 75psi. Wheels are balanced, and Centramtics. Installed 4/11/2012, have almost exactly 24,000 miles on them. Action's right, the shocks are original. Took possession 10/2007. 54,550 miles on trailer, to date.
Always CAT, and Sherline, so I know it's not an overload issue.
Was calling around this morning to try and have a shop true/shave them up before I replace the shocks. I guess that's a specialty most franchises don't offer. But, even if I can't get them trued, I won't be replacing them.
At this point, if I assume the shocks are bad, the only other thing that needs checking is alignment.
I'm surprised nobody else has ever seen this on a trailer...