At the end of travel the slide drops down into sill plate that has a circular depression in it (to create a relatively flat floor). That is probably the source of your sound.
If this was my coach, my first move would have been to call Tiffin Service and probably not post on this board.
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Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)
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