Hi Shawn,
Hopefully this should help you avoid some of the frustration I ran into with my trailer lights yesterday.
After hooking up my trailer, I got no power, as suspected, I checked my professional products fuse, nope, perfectly intact.
Next I looked under the steering wheel for the interior fuse box, nope no trailer fuse either (it's under the hood under the air intake hose).
Here's What I found in my research and resolution for my 2010 AWD SL Rogue.
First remove the intake (3 pop rivet at the front with a flip screw driver).
Then here is what you'll see:
Open up fuse box #2, remove the 30A spare 30A fuse (or go get one from your autostore, these are the mini fuse).
This is what you'll see when you flip, yes FLIP it over, the entire bloody thing comes out:
Hopefully, after this fuse is in, your "pre-wiring" harness should be powered now.
If it isn't, then you might want to follow up with this post:
trailer-wiring-harness-problems-continued-t385591.html
Where a use report that another connector isn't connected behind the dash after the firewall. Thankfully, my case wasn't that so I don't have any pics.
Hopefully this should help someone avoid the frustration I went through.
I wanted to thank Phillip again for cluing me in on the missing fuse issue.