Rules update 2 seems to confirm the legality of this, but they note that the bumper rules limit the size of the opening 26" centered on the front of a "wide" robot (minimum 6" bumper on each side of opening).
From update 2, section 8:
Quote:
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In the case of the archetype “wide drive” robot with a centered opening on the front of the robot, this can result in a significant limit on the size of the opening. This limits the ability for incursion inside the bumper perimeter by the trailer. See the example below.
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