I did a little work on this yesterday and took some pics.
This one shows the U channel with the wire taped inside(for the most part). The side closest to the camera is mounted just below the motor on the Bed side of the slide out.
This pic shows where the other side appears to have been attached previously. It was screwed down to the camper side of the slide and as you can see, there are grooves in the wood where the screw has apparently moved in the past. This might have been caused from the ziptie that can be seen in pic1. This was causing the bar to bind up when the slide was slid out. I cut this off but it does allow the U channel to sag a little. I assume that this won't be a problem as the slide comes in and out but not really sure what this is supposed to look like.
This pic shows what I did. I used a rubber grommet to act as a spacer. I also removed the screw as it was not long enough and replaced it with a long narrow bolt. The nut is attached in the compartment below the bed.
See any concerns with this set up? Is this close to how it is supposed to be?
Also, I removed a thin panel to gain assess to the motor and slide screw. I was thinking of adding something thin over this to go under the mattress. That thin panel is the only thing between the mattress and the outside.