sasq40 wrote:
Now next question is, should I add air bags?
Since we have pretty much the same truck (mine is a 15) I'll give you my experience.  I pulled a set of Air Lift's from my previous truck before I sold it.  Since I already had them I put them on the dually.  I can tell some difference in the empty ride as it seems to be smoother.  My Excel weighs 15,500 and the hitch weight is right at 3000.  If I put more than 25 pounds of air in the bags when towing it starts to ride too rough.  I usually run 20 pounds.  I never towed without the bags so really can't say how it would be without them.  My guess is they are not really needed.  I would try it first and see what you think.
Not sure you will get much sag with the camper but the bags would help to bring it back to level.