Kid, I believe a squeak is common on coilies, but a knocking just doesn't sound right...
As an update I took off the rear wheels today, and discovered the preload on the coils was a little loose, so the springs could be rattled on the collar. Tightened that and ensured it was equal on both sides, but turns out that wasn't the issue.
Also thought it could have been the tension bars for the boot hinge mechanism (not sure what their proper name is), but again that was a negative. It's looking like the pillow balls more and more
Only had the shocks a few months!