If you ever discover a dead outlet under the table in a slide-out model this picture should help tremendously in resolving your issue.
My wiring diagram showed one junction box in the curbside wire routing to the slide-out wall outlet, but the reality was there were two curbside! One under the cabinet beside the refrigerator and one hidden behind a removable panel in the right side dinette frame. My issue was easily resolved upon discovering the wire nut had vibrated loose on one lead.
I hope this adds knowledge to others