I found three or those in my 3010ds also. I think they are for the side slide, they seem to fit between the slide trim and the inside coach wall when it is closed. Will prevent slide from opening while moving. The Rockwood 1809s TT I had also had one, though it was adjustable, and in the walk-thru I got, it was explained to be for that purpose.
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2014 Sunseeker 3010DS
With chocolate, all is well
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