It's hard to tell from the pictures but it looks like the bottom support bracket has cracked causing the wall to sag. I would try to jack the floor back to where it should be and remove the bracket and replace it with something larger/thicker keeping in mind that it can't interfere with the slide closing. You might even be able to add an angle bracket over the cracked one, welding it at the corners, and extending it up the sides for support.
2007 Newmar DSDP 4023
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