The trailer wire would probably the the round type plug and I don't think it would look as good as the Neutric/speakon or the other twist lock type connectors.
I just drill a hole in the boat that fits the wire perfectly and connect it up below the deck with a loop. It's much cleaner than it sounds but you need to use round speaker cable like the stuff from
www.audiopile.net. I don't have my pictures on this PC send me a message if you want to see pix.