I've noticed that when my w/d bars are on that the tanks ore closer to the box, it seems that there may be a small bow, but so far no damage. Guess I better keep an eye on it. Maybe I should of checked farther into the unit that they kept asking me about last time mine was at Jayco for warranty work. I had a feeling that I had been having so much trouble that they were checking out about maybe taking mine back, don't know for sure just a feeling I had but we liked the floor plan on ours so much I wasn't interested but now I wish I'd of listened to what they had too say.