be applicable through port 72 as well whereby cylinder 56 operates as a conventional double acting cylinder cylinder 56 is shown schematically in fig4 where it is communicated to any known pressure supply mechanism such as pump 88 through a fluid switch 90 cylinder 54 is a double acting cylinder and it has two hydraulic connection ports 78 and 80 pressurization through port 78 will in conventional fashion cause lunette or eye 82 to translate away from cylinder 54 pressurizing port 80 will conversely retract eye 82 toward cylinder 54 pressure through ports 78 and 80 may be supplied by a pump shown schematically at 84 in fig4 or any other known pressure supply mechanism a conventional fluid switch 86 fig4 controls pressure flow to the ports the cooperative action of hydraulic cylinder 54 with motor 36 motor 48 and cylinder 56 will maneuver eye 82 into engagement with hook 83 or like device on a trailer vehicle not shown to be towed by robotic vehicle 12 it will be appreciated that eye 82 may be replaced by a hook pintle trailer hitch ball or other inter vehicle hitching element the operation of towing assembly 10 in the overall system where it functions is explained in conjunction.