I have read of plenty of fellow VXers complaining of a "clunking" sound coming from the rear when going over bumps.

I noticed the same problem since I got mine. The step I took about two weeks ago was to unscrew the gold latch hook the door latches into. I moved it about 1/8 inch toward the inside, and noticed the door shutting real tight now. It was since then that I last heard the clunk. It is gone ;Dp;