This was a smart purchase. These videos worked the way I hoped they would. My friend bought a portable building in the form of a barn with an attic. So I made a tiny house out of it. I made a bathroom under one of the attics. Need a door and the last one to get to the attic. I ordered sliding door hardware here from Revain, built the door and attached a ladder to the door. The ladder rolls with the door and can be folded to the side. That's why I need roles. They work the way I imagined.