Bed Slide Needs Raising

[rjohnsonnm]

I have a question about the bed slide on a 2004 36RS3. The slide seems to have dropped a little bit over the years and now is very tight at the bottom when it is closed all the way. It is so tight that the decorative corners on the outside bottom are bending outward and will soon crack. I have taken everything out from on top of the bed frame and see two large bolts in each outside corner, but those seem to be to level the bed inside unless they are threaded into the plate that's screwed to the wall. Is that where the slide is adjusted or do I need to remove the bottom sheet metal on the underside and adjust something in there?
Thanks for any help.
Ron