17’ Cascadia inverter questions

Ok so I bought a new truck. I’m an O/O and I’m loving this truck. 8mpg to the comfy not drafty cab and an “automatic” that is actually pretty darn good and I’m a believer in the DD15 motor.
But my question is with adding an inverter. My truck came with shore power and it does work, but did not come with an inverter. What I would like to do is wire in the inverter in a way that it utilizes the 110v outlets already in the cab. Is there a wiring harness available to purchase or a splitter off the existing that I’m missing? Looks like the factory ones were in the tool box on the drivers side. I’m very mechanically inclined but I would rather do it with parts than build my own harness. Thanks!

 

Correct that’s what I want to do but seems there would be a harness or something that would allow that without disturbing the harness. I could do it and be done no problem but I would like to also leave the shore power there also. That’s all.