My new Shocks....soooo sessy ;-)

[6pack]

So I've had these on since June or so. In August I noticed that the rear passenger side of the truck was sitting low. When I measured both sides (center of hub to bottom of fender) the rear passenger side was about 1.5 inches lower. I was at the dealer today for some maintenance and they looked at it and found nothing out of whack and suggested that the shocks need to be adjusted. Can that be done and do you think the shocks could be the problem? Thanks!