Power for sleeper outlets

I just had my dash apart trying to figure out where to plug in my back up camera harness for '15 Pete.
While I was in there I saw clearly labeled plugs/receptors for all the sleeper ports. It may not be plugged in if it could be so lucky to be that simple, but I'd guess that that's part of the tracing that needs to be done to evaluate fully. These are for low voltage apps, but I'm not sure if they control a relay that turns that on. Member below me has a solid solution.

 

Get a heavy duty 120v extension cord, like they use for appliances, it will be 6 foot or shorter, and you can plug the one end in your inverter, and the other end into the shore power socket on the outside of the truck. Of course it will look odd, and should only be used like that when you are parked. Some inverters, like the ones that come with the current ThermoKing TriPacs are set up that if you open them up, you can hard wire from the inverter to the cab 120V electrical system. But if you do not have electrical experience/abilities, I would not suggest.