Best Elevator Tripod

I am looking for an elevator tripod for our robots (S6's). I saw one about a year ago that was made out of steel and had big steel discs with rubber "soles" instead of points on the ends of the legs. The whole rig looked like it would have weighed 50 lbs. or so. Anyone know who sells these?

If you don't know who sells these, would you care to recommend the best one you've found for robotic work?

thanks