Add suction to the treads? A few air holes routed to the side of the tread where there's a vacuum pickup? I bet it would be tricky to get a seal that has low en

Add suction to the treads? A few air holes routed to the side of the tread where there's a vacuum pickup? I bet it would be tricky to get a seal that has low enough friction to allow the tread to slide past but still a good enough seal to get good suction from the bottom of the tread. Oh and it's got to last and last. Yikes... back to coding I go...