Merely a shot in the dark here, but perhaps double check to ensure the motors and mounts on the slide arm are all tight. It could be that there is a little play in their mounting, and when you get the point where the slide is almost all the way out, it gets slightly out of line, binds, and that is when the shuttering happens.
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5th Wheel: 2013 Denali 262RLX
Pull Vehicle: 2006 Chevy 2500HD Duramax, CCSB
Hitch: Reese 16k
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