I’d try to learn more as the owner. Find a road that causes the noise and try to notice what the coach was doing at the time of the noise - front wheels on a bump? Rear wheels? A dip to one side? Things like that. Then either station a clever partner in the coach to try to narrow it down as you drive back and forth on the road causing the problem or have someone else drive while you listen. Does it come from the top of the slide? The bottom? One end? Or maybe it’s something simple under a dinette seat or something. Good luck.
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