Hi: I rip a lot of 4X8 sheets of plywood, I have a Delta unisaw, i built a table the same height as the saw on the output end extending out 6ft. You don't say what your saw has for a fence, can you cut to the center of a 4X8? I also sometimes pay an extra dollar a sheet at my supplier, and he will rip it down to 2X8 for me. After a few heart attacks, I find that is easier, I'm not young any more,and a 3/4" 4X8 is about 75 to 80 lbs. MDF is 100 lbs. It also helps if you have a blade made for cutting plywood. I use blades made by Forest Mfg. that have every other tooth a bit longer so that it scores the plywood before the next tooth cuts it, it's called a Hi-At blade.
Hope this helps Woodnut65