Bought a 2011 Touring in September. After the winter found the rear end incredibly creaky. Large suspension travel doesn't seem to make noise, mostly slight bumps at low speed. Seems to be worse with asymmetric suspension travel, like trying to pull into a sloped parking spot.

Check everything - suspension and brakes. Everything seems stiff, nothing loose, no rattles or clunks.

Is there anything back there that should be lubricated?