Another thing to check is to see if the living room floor is separating from the walls. If you open the side compartments under those slides, you can look up and see. There's only a handful of screws holding it. On the ODS of the trailer, I had up to a 1/4" of gap. I added a bunch or #14x2-1/2" self tapping screws and fender washers to pull it together. The floor braces those walls either side of the living room slide.
The pics were taken after the repair. I went around every compartment front to back and added screws. A lot of them were loose from the factory.
The only issue I have had is the front bedroom slide stud break which I posted my fix to it. I never had the siding tear as it flexed in that expansion joint.
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2013 F350 Lariat Ultimate CC LB
2019 3790RD
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