Yah, I got the same thing from Schwabs, OR...
I'm pulling to the Right and figured I knocked out of Alignment... They couldn't do it at that store as they advised and best to do it with the camper ON...
I guess it makes some sense as it's more weight, and I've always had a 'Lean to the Right' side which bugs me and the tires, were low, 60lbs s/b 90lbs (19.5) (working on the Air bags and compressor for tires)
Seemed to track a little better, so it might be just low air, if I'm lucky..
But YES, they recommended the camper on for alignment...
I'm full time so don't take camper off very much..