It's a 12. The dealership told me in October to bring it back in 6 months because of a spot on the frame so a frame replacement maybe forthcoming. I love the truck but at $45 to $50k for a new one I'll be keeping this one until it falls to a bucket of bolts.
Ralphie Boy Had my frame inspected last month. Does not need to be replaced but I must have frame sprayed with their stuff or will not have any coverage for rust in future! They ordered kit for spray, said it takes 2 days to do.
I had that done to my Tundra a few years ago. Doesn't take very long for it to start peeling off. If you want to help it stay longer, do some serious de-greasing prep before you take it in.
I used to spray the bottoms of my trucks with used oil then head down a couple gravel roads to dust the oil so it would stay put. It's hard to find a gravel road around here anymore... Everything is paved now.