It's a great design but IMHO I don't think it will push a 120 pound robot with trailer around the arena. Just my $.02. I'll take our wheels on regolith to move any day.
I do take offence though that just because allot of people have concerns about the safety of the props being call "safety nazis"
Also, concerning your ball gatherer you may want to look at this rule:
Exterior or exposed surfaces on the ROBOT shall not present undue hazards to the team members, event staff or GAME PIECES. Reasonable efforts must be taken to remove, mitigate, or shield any sharp edges, pinch points, entanglement hazards, projectiles, extreme visual/audio emitters, etc. from the exterior of the ROBOT.
All points and corners that would be commonly expected to contact a GAME PIECE should have a minimum radius of 0.125 inches to avoid becoming a snag/puncture hazard. All edges that would be
commonly expected to contact a GAME PIECE should have a minimum radius of 0.030 inches. All of these potential hazards will be carefully inspected.
* gets off soapbox and puts on flame suit
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