A tow hitch built onto a truck or s.u.v. that can move left or right (probably almost the width of the vehicle) via an electric linear actuator that would be controlled using a switch mounted in the driver's compartment, or by a wireless remote controller.
Of course, the further back the wheels of
the trailer are, the less useful this would be.
*UPDATE*
The trailer hitch will also include a much smaller second linear actuator, that would be able to extend and retract the hitch a few inches.
With this device installed onto your vehicle, you can just back your vehicle up to the trailer, then get out and position the hitch electronically. Or you could install a camera onto the back of your vehicle pointing at the hitch, and install a video monitor inside of the cab.