I think someone else mentioned 2010 unit with 2008 tires OUCH, not much you can do now,,, I use Discount Tires a lot and like their service,,,, when I took my unit up them (2008/May tires 6500 miles) I was also worried about cracking, service guy had a chart/card with pictures on it to compare,, no problems so get that second opinion somewhere,, BTW, if you decide to buy make absolutely sure you get you unit aligned food for thought,,, you can research this,, but most of us Not all of us are going once you get these Beasties align and everything going good, leave'em alone except tire pressure
Let us know about your second opinion results
David Sparks
2008 PC 2350
Houston