I saw one in Florida that was on a 75' motor yacht that the owner purchased on Ebay. It was pretty simple, made of aluminum diamond grid, and had a fold-down rail on one side. It weighed about 50 pounds, and was about 6-feet long and 18 inches wide. He also had some glue-on strips that resembled course sandpaper that were about 12 inches X 1-inch and provided great traction when the gangplank was wet. He paid about $250 for it, which I thought was a great bargain.