Cutting large sheets of plywood by myself can be a daunting task. Instead of asking my wife to lend a hand when I need help ripping these large panels, I made some outfeed supports that mount in the T-tracks of my rolling shop carts. Centered on the plywood block in one direction, I drilled holes for a hex head bolt that threads into a knob. This ties the supports into the T-tracks. In the other direction, I drilled holes to install the two T-nuts that house the plastic levelers to hold the supports steady (photo below). The caster mounts in the center and might need to vary in size depending on the distance between the top of your shop cart and the table saw top. The drawing above and detail below provide all the information needed for the versions that I made for my setup.