Yes those are the Accuride 500# locking slides, and they do require two handed operation the way the boxes you see above are built. See www.trekboxx.com for some even better work and an idea on how to install a handle next to the locking mechanism for one handed operaton.
I am a huge fan of the Accuride slides, have used them for ARB63qt fridge slides and as long as a 60" unit and has held up wonderfully. I've got the tool and recovery gear drawer in the back of my 100 very heavily loaded and the accurides are as smooth as silk.
Great- thanks for the feedback, I appreciate it.