Gotta 2nd this, and I've never used the OEM piece in any of my tow vehicles before the Murano. There's a serious design flaw in the Curt harness that causes your trailer running lights to only work about 1/2 the time. I went through 2 of them before I got my voltmeter out and realized they weren't even monitoring the right output on the factory harness. Emails about what I found went to Curt and were ignored. Put the OEM Nissan part in years ago and it has worked flawlessly since.DO NOT use anything but the factory trailer hitch wiring harness when you install a hitch. You can order it from Courtesy parts and you'll be happy you did.
If you live in salt country I would suggest making a little change to the OEM wire routing suggestion though and just route the 4 wire plug into the trunk. When not in use keep it in the spare tire well and when you want to use it just pull it out and shut it in the door, taking care that the wire avoids the latch. This way you don't end up with a rusted and useless plug after your first couple winters. I added a 2 foot extension to mine in case repeatedly shutting it in the door eventually breaks a wire. If it does I'll just unplug it and plug in a new 2 foot extension. 3+ years and it hasn't failed yet though.