Welcome to the forum and irv2.
Question why is it nessary for you to manually open your slides.
All slides have 12v motors or possibly hydraulic operation of motorized pump for moving a FWS.
Here is a thread
with links for Newmar Owners explaning items you need to be familiar with.
A
link to help find your way around irv2.
Brochure --
Owners Guide
The FULL WALL SLIDE what you need to know before opeating the FWS.
ALL slide spec's and slide info found in
QT's 1 & 2 and all links below in my signature have answers for your Newmar.