Let the dealer check it out, won't promise ya they will get it right the first time though.
Here is a post from a while back. My problem started with a bad sensor on the drivers side that helps to keep the truck level. I cannot prove it (they told me it was okay to drive till they can fix it) but I think the one air spring was not seated correctly and after they replaced the sensor it "slide" off the axel causing what you see in the pictures. I think it was a fluke/oversite that they didn't check to see that the air spring was properly seated.