Personally, I think game pieces are considered "field elements" and teams will penalized for resting on them.
That said, I do think they should bend the rules a bit and allow creative teams the opportunity to stack a robot on top of the tubes. Though they should assign a penalty if the robot happens to pop them. Making it a fairly risky endeavor, but it would encourage some creativity from teams. Though you've got to consider, the only reason you'd want to do this is so that two robots can climb on top of another robot, and you'd want to support that one robot off the ground. So we're not really talking about whether an inner tube can supporting 120ish pounds of one robot, we're really talking about supporting 360 pounds of 3 robots!
Yeah, I don't think it'll happen. Of course there's also every individual robot climbing onto an inner tube, which would also be an option, though once you get to this pointt would be much easier for teams to just design a decent ramp
