Just a guess, but I was camped next to some folks a couple years ago or so that had a similar noise and vibration. We email back & forth and he told me later he found on the drivers side the lower fiberglass panel that extends back over the tire, he had found was glued to the metal frame work and had come loose. Sometimes the air would catch it just right and it made a clunking sound as it flexed, other times it would get to vibrating he could hear it and feel it. He told me he re-glued with epoxy and so far it's held. He found it by hitting lightly on the fiberglass panels with his hand.
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2000 Itasca 35U
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