Using slide supports will possibly void your warranty, as RV manufacturers warn not to use them.
Slide supports are leftovers from the early days of slideouts when the technology was new and there were many issues. The modern slideout shouldn't need them.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package