I had the same thing happen on my 5th wheel on the wall forward of the kitchen slide, same place as yours. The dealer had to pull the wall panel back and re-weld the wall to floor and add a bunch of reinforcement, which wasn't cheap.
They said the cause was that the slide wasn't lubricated well enough but I never had any issue with it, so I think it probably just a weak weld. Now I keep the slide bottom well coated with non-stick PTFE spray lube on the first sign that it's starting to catch a little when moving in and out.
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2017 Cougar 333MKS
2014 Ram 2500
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