There is a set of Nitto 555's on mine. And they are junk. Literally. Only have 1/32" worn off the tread, and tires are 2011 mfr - but the sidewalls failed the "Road Force Balance" machine at my local Chevy dealer. Can't get Nitto to warranty them (long story in another thread here somewhere), and they won't balance. So if I have the $ this spring I will have to put something on mine so I can drive it over 60mph without shaking my fillings out. Probably look hard at those vred whatevers...
Just looked on E-Bay - they are $945 for the set now...