The video link was posted in 2014. According to some gurus on this forum, recent recommendations have been to NOT lubricate slides. There seems to be mixed opinions on this issue. I would call the manufacturer's CS and see what their latest guidelines are. Post here what you find out from them. My dealer told me (3/18) to NOT lubricate them as this caused less friction/grip/traction on the gear bars and could result in slippage. He also stated lubrication will cause dirt and dust to accumulate causing excessive wear. Most important thing is examine them when fully extended and keep an eye out for metal shavings or unusual "wear spots" on the gear bar.
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie