[eNyoron]

What if you were to construct your robot in such a way that it can reach into the trailer while staying within the 28 by 38 bounds? For example, what if the robot was 28 by 14 and had a two foot extendable arm that knocked balls out of the trailer?

In this regard, the rules seem to be vague, since you stay within dimension constraints at all times and don't really "grapple" onto the trailer.