since you didn't post what year it is, it could be an early model that may have had problems.
slideout supports are an old holdover from the early years of "tipouts/popouts".
the technology wasn't as good as it is now.
slideouts in last decade, don't need supports and the manufacturers advise not to use them as they will damage the slideout.
the slideout frames now support the slideout very well now.
but i seem to remember that the early Roo RS models had a few growing pain issues, since the rear bed slide was a new thing for them.
but if you've bought it used, you don't have any warranty recourse.
or the previous owners DID use some sort of exterior support and did the damage.
also, pics will help a lot.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC