Going to look at a used 2011 crew cab z71 tonight. Its not really what I want but if this dealer will make me a good trade offer on my truck, I may go for it. Any absolute drawbacks to the 2011 and 2012 over the 09-10 other than the urea bs? This truck is going to be geared towards work and will probably get nothing more than a programmer. I have other plans for racing.