Jared, bulging/sagging sides is unfortunately a common occurance on the DL's. Stand at the front corner and look down the belt line and you will probably see an arch over the rear axles, signs of underlying structural damage and weakness. If the sides are bulging its a good indicator of underlying rust issues as others have said. When I was looking for a bus before I bought mine, I looked at several that I could put my hand through the sides by the rear axles. I paid more than I care to admit for my bus, but I felt comfortable doing so because after thorough close inspection the body appeared to be in excellent condition with barely even any surface rust. I can look down the belt line and see no sag or droop.
On mine, I'm not going to worry about it until I have to. I can see where the panel is being pushed out a little but there's no signs of any separation any time soon. I just wonder how feasible it'd be to detach the bottom seam, pull it out a bit and clean it up in behind the panel?Jim
If the coach, at some time in the past has backed or pulled into something, the panel above the wheel wells can bulge or buckle some, as that is the weakest point on the body.