a simple search on slide supports or braces, will bring on a ton of recent posts asking the same thing.
slide supports are things from the early days of slideouts, when the technology was new.
anymore, manufacturers say NOT to use them and if you do, you void the warranty.
there should be something in the owner's manual or posted in the trailer, warning not to use them.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC