I have a 2010 DC,I've had it for about a month.10 days after getting it I had the org. tires replaced [dunlap at20's 245/65/16] with yokohama geolanders 265/65/16's, thats when the steering shake began though not bad it was annoying between 55-70 mph.I bought the tires and wheels[renegade 6] at Discount Tire
. I took them back the next day and they were not busy,they put two people on it and road force balanced it.I left the store and got on IS270 and as soon as I got to 55 the shake was there a bit worse than before next day did the same thing and got the same result plus the left door now had black finger prints on my tan interior. Called the manager anthony and told him how unhappy I was about the whole deal! He said bring it back and he was going to make it right.He also offered to have my interior detailed at their cost. I returned today and they offered to replace the yokohamas for a better tire at no additional cost to me. I said OK but the problem must be corrected. On went a set of 265/70/16 michelins LTS/MS in about 40 mins. I left the store and got On IS270 got up to 55 and...................smooth............70 smooth..................80.............smooth. They had cleaned the door panel and I am one happy guy. I hope it turns out as well for the rest of you guy with the shakes. And Thanks to all the people at Discount Tire [fishinger Blvd store] they have my recommendation.