it's funny how some dealers have all the cool stuff, while others are left in the dark. i think has to do with the employee's and owner's. if the manager's and owner's are willing to provide the public with aftermarket items you will see them offered at your local dealer. also the more experienced parts people can get you just about anything you want. at least where i shop for GM stuff. what you won't see at my favorite local dealer is a heavily modded Sub, Tahoe, or AV. with the added price it adds to the already high sticker they just don't move. that's why the dealer around the block from me sits on these type of vehicles for months.