It looks like your butt is sagging...have you gotten the suspension TSB yet? You would get 4 leaf springs in the back.
As of today (Monday, 02/04/2008), the truck is at the Dealer because of a TSB request, second time for this same reason, first time they did change the rear leaf springs BUT they installed the same 3 leaf type as before, even when I requested to do the proper TSB to solve the bottoming out. Let see what happens in this last visit.