I'm sure you could upgrade it, might take some custom wiring to get it done. You'd obviously have to run the motor wires back in a tether to the trailing unit. I suspect you'd probably want to run some lighting back that way as well.
You may be able to use the existing 4-pin tether to get the job done. I'd probably be looking for directional lighting, etc. so I'd use the 10 pin tethers myself.