and right driving motors 1003 1002 the left and right driving motors 1003 1002 and the power screw motor 1001 are operated by batteries which may be rechargeable lithium ion batteries the batteries are preferably located at or around the device center of gravity to enhance device stability the remaining charge of the batteries may be reported to the user by an indicator provided on a control panel the power screw motor 1001 may lock itself if the battery is low to prevent the power screw system from collapsing the device may include a mechanical coupling feature on the front side of its top portion such that the device may be used with a trailer connecter to lift and move the device fig1 a 14 b and 14 c are perspective views of different parts of a trailer hitch connection and accessories in this embodiment the top portion of the power screw joint 1031 is a hollow cylinder 14001 with a pin cavity 14002 the hollow cylinder 14001 is adapted to receive a hitch accessory 14003 a hitch connector 14005 is mounted to the top portion of the hitch accessory 14003 and is adapted to be received by a trailer hitch 14007 the hitch accessory 14003 has a first hitch accessory pin cavity 14004 and a second hitch accessory pin cavity 14006 the trailer hitch 14007 also has a trailer hitch pin cavity 14006 the hollow cylinder pin cavity 14002 and the first hitch accessory pin cavity 14004 are aligned when the hitch accessory 14003 is properly placed into the hollow cylinder 14001 so a pin could be used to secure them together the second hitch accessory pin cavity 14006 and the trailer hitch.