The number of hours I've spent finding sensible info now is pretty high.
Lifts:
Coleman:


Andrew Gibbens lift design (modified for XPStream by OP827):
http://tnttt.com/viewtopic.php?p=38750#p38750
Slide-outs:
The 6 Types of RV Slideouts:
https://www.youtube.com/watch?v=nYDBvuWnHrs
Pulley/Cable Systems:
BAL Accu-slide: https://www.youtube.com/watch?v=V7F6HRn_4cQ
Worm Drive:
Lippert aka. Schwintek: (I dislike these guys. They will NOT sell aftermarket. You *can* order parts but I have yet to figure out what their rack & pinion pitch & depth is to have one made. I get that they try to not let you buy their stuff aftermarket because they had some brand damage from inappropriate use but holy cow we're just a bunch of home builders.)
Rack & Pinion:
LCI (Lippert):
Possibly: Gate Opener Hardware has easily available rack & pinion units.
Other:
LiftCo Glide-Out Rooms:
https://www.liftcoproducts.com/all-prod ... descending
DIY:
Possibly Gate Opener Rack & Pinion:
https://www.alekoproducts.com/ALEKO-AR9 ... nor-ap.htm
https://www.youtube.com/watch?v=kmKkNRVc6v8&t=18s