Your in luck with your question, I'm the brother that docosu was talking about. I bought that truck from him last summer, it now has 62,000 miles.
It hasn't had any major issues, goes through the tires like a demon due to the setup on these Platinum editions from 2011. 22 inch rims, all that power....docosu and I talked the other day, it's on its 3rd set, and about to get another from me in about 5-7000 more miles (maybe earlier, one tire has had to eat several nails lately due to all the damn construction in my neighborhood).
The 6.2 is one mean mofo. Sounds like an angry lion at full throttle and I pass everything but a gas station lol. But I don't drive that much really, working at home, I doubt I put much more than 15,000 miles on it in a year.
Very comfy trucks, we prefer it over the Grand Cherokee for trips and such.