Is it possible that the coach may have had a little rear damage at one time? Have you measured the the height of the frame at different points from the ground? I would do some checking and look for rust as stated by David above. I would do the measuring with the suspension in the full height position. You will also have to consider about the suspension being accurate or not. If you see some measurement issues or serious rust then it would be a chance of possible sag. I have seen a few Newells with wrinkling sides and they were not rust buckets. Hope I may have shed some thought on this for you.
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