The real answer is that it is not structurally strong enough to support its own weight, especially taking into consideration it's being bounced down the road for however many thousands of miles you have on the coach.
My best suggestion is to build a support pole that can be put between the floor and the ceiling of the slide that will support the ceiling while traveling, then take it out while parked.
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2019 Fleetwood Discovery LXE 40M w/2021 Equinox
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