these things are holdovers from the early days of slideouts. they were also called tipouts. the early ones had technology that was brand new and stabilizers were seen as a fix for some.
modern slideouts don't need stabilizers and using them will void the warranty, if it causes something bad.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC