HappiJack alternative? Vertical bed lift

Can any of you mechanically inclined types help me figure out how this is done?
There's this YouTube video showing a terrific and less expensive vertical bed lift. I don't know how it's done though.
See here:
https://www.youtube.com/watch?v=Ebxn1UQ ... ture=share
I think it might involve something like this:
https://www.amazon.com/gp/product/B00IA ... T8LUUD0H90
and maybe this:
https://www.amazon.com/Dee-Zee-DZ43102- ... GJ7H8DNA7F
But what the white pieces are I have no idea. Does the bed frame just rest on the top white pieces? Or does it click on it?
I would love to figure it out!
There's this YouTube video showing a terrific and less expensive vertical bed lift. I don't know how it's done though.
See here:
https://www.youtube.com/watch?v=Ebxn1UQ ... ture=share
I think it might involve something like this:
https://www.amazon.com/gp/product/B00IA ... T8LUUD0H90
and maybe this:
https://www.amazon.com/Dee-Zee-DZ43102- ... GJ7H8DNA7F
But what the white pieces are I have no idea. Does the bed frame just rest on the top white pieces? Or does it click on it?
I would love to figure it out!