Got the 6.6 Duramax diesel with the Alison 6 speed. Rated #1 for 08. Tows like a champ, Plenty of power. LT2 package, rear differential locker, Bose speaker package, OnStar, XM radio. I added a spray in bedliner and sliding 5th hitch too. My opinion is that Chevy is far superior to Dodge Cummins 5.9L. Go get one.
The interior has a nice look and feel. Gotta feel good when your in a truck as long as I am.
Small stock tires, size is 245. I upgraded to 285s. Looks good now.