Yes I think your tech is spot on. Your slide floor is not supported when closed.
You may even see a gap between the slide floor and the main floor. This could /would cause the slide floor to bow and adding stress where its connected to the walls of the slide out.
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2014 LaCrosse 323RST-TE-C
2009 Chevy 2500HD Z71
Seasonal
Zelda the campin dog
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