I have a similar problem exception that the sound seems to come from the left rear area. If I go over bumps with only the left tire I get very little noise, but on the right side its plenty loud at low speeds. I can also stop the noise by driving over bumps with the emergency brake lightly applied, however this only says that if I bind up the rear wheels they are quieter.
I also have gotten into the trunk with the lid open and jumped up and down. This does not produce the noise, so forward motion is part of the condition needed to make the problem appear. It does not help to isolate the problem. I am stumped and I am not willing to spend money randomly and hope it works. Unless I come up with a definitive answer I will continue to use the car until I get a full failure even if it is irritating. Any ideas?
