After an all day adventure to the coast this weekend turns out the rattle was apparently not just the plastic cover, but the entire bolt and tie down bracket. I ended up pulling both bolts and removing the brackets on each wheel well. The rattling is now gone, but I am already sick of this vehicle. No there is another sound coming from the back seat area. Sounds like a metal spring bounces a couple of times every time I hit a bump. Looked under the back seat and there are wires all over loosely attached to the under part of the seats. It is really disheartening to spend almost $30000 after tax and have this crap happen. I could take it into the dealer and let them deal with it but it is a huge inconvenience and then you have to prove it to the dealer.