At JCC you will find instructions as well as a short video so you can build your own table saw infeed support arms.
This is a link to a Google 3D SketchUp drawing for a cart for moving sheet goods and for infeed/outfeed for table saw. You will need the SketchUp software to download this drawing and its freely available online.
Gordon Gaines of Oakdale, California wanted to extend the short tables on his thickness planer, but did not have room for a large, permanent setup. His solution: these fold-away extension tables.