Mitch, I saw a came table on the HGTV house re modeler show that had a ping-pong table that was a rotisserie mount. It was similar to the engine or car body set up.... and after searching for 30 min. I could not find the video..... (Kitteh would have been disappointed with me) However...
They fabricated one out of wood. I also saw a similar design made out of metal tubing. He did use a center pivot point (pipe in pipe sleeve for the bearing/load and for the "T", and the Triangle T for stability)...... Interesting add was on the metal tubing. It had a spring handle that pulled the two stabilizing pins back from the table, allowing the table to rotate. When it lined up again, the used compressed the handle, retracting the pins, lined up the holes and the springs return the pins to stabilize the table again.
A Photo is worth a thousand words from an old-retired-motorcoach driver... so ill find one.
cheers!
Salute to the Kitteh