Wondering if anyone has seen or built what is effectively an extension sleeve with casters.
I plan to build a storage crate that I’ll place along the exterior wall of my garage.  Without going too crazy into the details, I want it to slide on casters or rollers so I can leave the back open and glide it along the back exterior wall to access the contents from the back opening in my garage where there’s another garage door.  I’m thinking some kind of U channel, but it needs to act like an extension drawer slide.  Any input would be appreciated.