I am about to do a power door swap and the main harness inside looks like most runs down the driver side. The wires run on the driver side under the carpet to the rear
Look at my pic and u can see the harness I got was cut just past the rear speaker connections. I haven't looked at my current one but I assume there is an actual connection for tail lights and 3rd break light and hatch light as well as rear wiper.
Hope that helps.