from my knowledge you can use a remote switch on your radio for the power landing gear and your switch for your fifth wheel to open and close it as long as it is a 4 channel radio.as far as the light cord .yes that cord powers the rear trailer lights which gives you the running lights signal lights and brake lights on the trailer although i think i saw somewhere someone had put lights on the trailer by a wireless remote.i can't think of where i saw it.hopes this helps you out
