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Re: 3-wheeled robots
But the hitch-swivel in the tongue of the Trailer can rotate, so it does not provide stability for tippiness to the robot. It does provide some types of stability and/or weight to the bot, but you cannot depend on the trailer's wheel-stance to reduce tippiness.
(i.e. if it tips over, it does not induce a torque on the robot, the hitch-swivel simply rotates.)
For reference, see the 0900 (Trailer) and the 0936 (Hitch Swivel) drawings
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