1987 Broncobots had a kick@$$ conveyor belt system this past year (kinda reminded me of what 1986 Titanium did in 2013 with their full court shooter
) but I believed it was a surgical tubing type conveyor with pulleys at each end to keep it in line and to control the flow of boxes.
See it folded up. Roughtop is also REALLY grippy (we used it on my FTC team I help mentor last year and literally wore down the tile flooring during a mis-programmed auton.