Slide out pulling back bedroom slide in too far.

[Chinito]

I have a 2011 Georgetown 360DS. My warranty has just expired in April. On my trip last week, I noticed that the back bedroom slide was pulling in too far and the bottom trim was bowing in. All the screws under the bottom, outer trim of the slideout have been stripped off. Some are gone and the others are very loose. I tried to screw them back in, but the screws will no longer grab. The sealant from the outside and inside is also cracked. When it rain now, the water runs from the outside and out the holes from the underside of the slideout. I checked on the inside, and I do not think that water is getting in. Is their an adjustment that I can do to keep the slide out from pulling in so far? I am not sure how I am going to get the screws to grab again. I will definitely have to re-seal it when it is fixed. Can anyone suggest any help?