Hey everyone, yeah, I'm here to answer some of those questions. So first of all, the entire ramp assembly is about 20 pounds, and is about 91 inches long. The whole ramp telescopes out from the top of our robot, and employs the use of a pulley system. We are not going to use any other traction material ontop of our existing ramp, as this would add too much extra weight for what we want to do. Thanks all for the interest, we'll keep you posted. Oh, and we just had four robots on top of it
-]-<.