Bryan, the harness is $70 more from DMC and hooks up to the bikes lighting and power systems for the trailer plug. It isolates it from the bike for protection. You can probably get more info at the DMC sidecar website.
Sorry I ducked out on you there. Here are some pics of the one I have. It mounts to the side of the bike and has the back panel with crossbucks. There is a harness and electrical plug receiver. It came on the bike, so I don't have a manual, but wrote down the color codes of the wiring it was connected to. It came on a 2003. I would be looking for $200 for it plus whatever UPS wants.
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