Would anyone be able to share with me any info. on how their trailer hitch wiring is done. I am having trouble finding someone who knows how to tap into the Muranos wiring, even the dealer doesn't know. Is the wiring harness tapped directly into the wires in the back spare tire well? Is a separate power module used like (Modulite). Can anyone share what experience they have with their dealers and installing hitches, would also like to know how much they were charged. Thanks