Vertical Sheet Goods Storage

Anyone have a sheet goods storage rack that allows storing 4x8 sheets vertically on the 4' end? With my 12' ceilings I'm thinking that could be a nice way to go for longer term storage. I built a roll-around cart, but it is very hard to get to the back sheet (which is always the one I need,) its full because of a bunch of material I got at an auction, and its hard to move. I'm thinking I might just use it for current project materials and build the upright storage for everything else. If you have pictures, I'd love to see them.

FWIW, the photo (if it shows up) shows my 'solution'. Basically made a 4.5' deep closet with no door, full room height. Raised the floor in the space about 2.25" (2x4+3/4 OSB). Put 2 rollers on the shop floor in front so they project a little above the storage floor. That way I can set a corner on the roller and roll it in or out without damage. I still need to put some eyebolts in the back and on the front corner so I can use bungees to hold the material vertical.