I have just bought a CLK 550, 2007. On what appears to be a fairly smooth road at around 40mph+ the ride feels a little "bubbly" - I can feel vibrations in the seat and surrounding areas (a little like a sub-woofer vibrations - but the audio is off!). The dealer said this was due to a bent rear wheel (which he straighten for $90) but I didn't notice any change in the ride. Any ideas / comments?