Since I have owned the car for only two days, should the return to the selling dealership and show them your post and others here and ask them to fix it? I don't like the idea of removing the trim to fix a problem from the manufacuturing process. I didn't hear the sound on my test drive, but began to hear it on my way home from the dealership. My wife drove it today for the fiest time and asked why I purchased the vehicle (just what I wanted to hear).
I removed he spare tire lid and checked to see if the spare tire is tightly secured. The jack is supported by a piece of foam that rests loosely on the spare tire. Is it definitely not a tight fit as it moves vertically with under light preswure. Is is a very low budget way of holding the jack in place. Even with the potenial movement of the jack, I don't think that this is the cause of the load "clanking"sound when going overrough roads or bumps.
In addition, has anyone tried to remove the two smaller covers on each side of the spare tire lid? I tried to remove them but now believe that are not designed to be removed. I may have damaged the plastic attachment on one side while trying to remove it.