Steering Wheel Vibrate problems of the 2006 Nissan Titan

I have owned my 2006 crew cab since Dec 2006 and have had problems with steering wheel shaking while braking. Took truck to dealer in 2008 miles 10, 850 they turned the rotors and applied grease. Took truck back to dealer on July 9th 2010 and they again said rotors needed to be turned the truck only has 27,980 miles. The service man said the rotors were no longer covered and I would have to pay have rotors turned. I was told the rotors were good for 30,000 miles. I think it's strange that the rotors need to be turned every 10,000 to 15,000 miles. Service man acted like this was a command thing and that it was the drivers fault not the company's. I asked about recalls at the dealer and was told they would contact me I have not heard from the dealer since. Nissan needs to see this as a manufacturers defect and make a recall.