Our 2015 Passport 23rb has a cable activated slide. There are no rails or supports, rather the slide rides on the locally carpeted floor of the TT which supports the slide vertically. When the slide is extended, the "overlap" of the slide walls are supported by the walls of the TT.
As for load capacity, I suspect it is close to 1000 pounds when extended. We have had over 700 pounds on the sofa in our slide on the sofa without problems when extended. But when retracted, do NOT walk on the slide floor or put any extra weight on it. This is because the portion of the slide's floor that extends into the TT is not supported when retracted and can "pull away" from the underside of the slide walls if loaded.
When we travel cross country and are making a quick rest stop and do not want to level the TT and extend the slide, we slip four large (13" x 17") plastic cutting boards (from Walmart) that are 3/8" thick under the unsupported end of the slide floor. This way the the slide floor edge over the vinyl flooring and the sofa leg are supported by the cutting boards and we can walk on the slide floor and use the sofa without concern.
Our winter project was to cover the cutting boards with fabric and add a larger diameter foam rod on the ends of the fabric covered cutting boards. This way we can leave the cutting boards under the slide floor while traveling without worrying that they will slide underneath too far or bouncing around while travelling and damaging the floor.
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2018 Jayco Eagle HT 265BHS (previous: 2015 23RB Passport Elite, ProPride)
2015 F250 XLT SB Crew, 6.2l gas
PullRite 16K SuperGlide w/SuperRail
Reese 5th Airborne (bagged) Pin Box
RoadMaster Shock Kit
X-Factor Cross Bracing
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