No no no Rod. You'll never get underground romex through the marker lights and that's way over kill. Best I can tell is you're only talking two conductor wire from the lights down to the cab. Go to anyplace that sells "trailer" accessories. They'll have the wire, disconnect, etc. You don't need conduit or anything else. Or I can give you a website that you can buy all your wiring needs including relays, etc.
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Jonahs
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