As far as the buttons in the center console. They let you adjust the hieght in the rear for putting things in and out of the back...kinda nice. And it will adjust the hieght to keep the truck level when you fill the back with alot stuff or there are people in the back seat. It even adjust itself as you use up gas. Something I had to get use to....when you park the truck and start to walk away you can hear the air coming out for about 5 or 6 seconds and you turn to see the back of the truck going down....
It actually came as a package with the XREAS shocks on the limited.
All I know is once I saw them at the dealer it would have driven me nuts if I just had blanks when I knew what was suppose to be there.......of course it cost me alot more $$$ for the privilege tho....