I do not know about 50 sheets at a time, but there is a cart made that would hold 10-15 in a vertical position. From vertical you can tip it horizontal and lock it in place. You then pump a foot pedal to raise the stack so you can slide the top one off the stack. There is a company that I have seen ads for in the different wood magazines that make all types of carts, sorry I do not know the name. Hafle in the uSA sells a knock off for about $475. I use it when cutting a lot of plywood on my Altendorf table saw, works great!!