Aaron Z, we were thinking that a 250 pound payload cart that could travel quite a distance could shuttle produce to these bins, replacing the transit time that laborers might otherwise take. The cart could follow a laborer out, and then once full the laborer could push a button and the cart would run back to a set point to be emptied, or to dump (if possible), before returning to its laborer. Are we imagining a problem that doesn'tf exist?
Regarding the functionality, we would of course have bumper bars, safety stop switches, etc. Once you get to larger robotic machines (i.e. 1500 pounds) you need much more sophisticated obstacle avoidance however which would render a unit far more expensive than a tractor and not commercially viable.