Here is the answer after a few days in a MB specialist shop. (They give a nice price break if you let them take thier time and do the work as time permits).
I stopped by today to see the progress and there were multiple noise sources.

1. The tie rod bushings for the rear stabilizer were gone, transmitted some noise to the chassis.

2. The big one, The right rear outboard wheel bearing was failing. This was the main culprit and caused the regular "Clunk" when the drivetrain was unloaded.

I can't wait to get my QUIET car back!

Total bill with Front End alignment will be about $400.00.

Best Wishes, Ron