19X36 opening. Slats are 3/4" wide. Tracks must be parallel. I had to put some shims in the back as the plywood sides aren't on the same plane as the steel frame. I added a conceal across the top to hide where the door makes the corner. Other than what felt like 50 million cuts with the hacksaw it was a breeze to install. #6 button head screws in the corner pieces and #4 button head in the rails. Might do 1 more opening in the van with it.
1 drawback is you need clearance at the rear of the cabinet for the door to go down the back when it's open. If you have a cabinet you want to stuff something in like a duffle bag or blankets you may want a wall in the back to keep from interfering with the door. Also, the rails interlock with the corner pieces at 90 degrees so you couldn't follow the angle of the van wall down the back. If your cabinet is the same depth and height it won't go down the back at all though.