Just had mine installed yesterday at my local GM dealer, as well as the bed lighting kit... They both look awesome....
And yes,, it does include all the hardware for the install.
I upgraded from 275/55/20 Goodyear Wranglers to 275/65/20 BFG AT-KO.... I also had a Rough Country leveling kit installed.
The only noticeable difference is the MPG, I lost about 3 mpg.... Oh, the other difference is now my truck doesn't loose traction in wet grass...