I have an '07 RX 350 which developed a rattle in what seemed like the right rear of the cargo bay. When in for the next service visit I mentioned it to my rep and he said there was a service bulletin for this issue and would be covered under warranty. They replaced a "panel" and the noise went away. It was only when on rough pavement or hitting a speed bump or driveway. I happily report no other noises (of course except the "roar" with all the glass down and doing 140MPH).