I have a different floor plan, so I do not know where your roof vent is in relation to your trailer.
In my previous Premier, I found that my vent wasn’t too far from the microwave. I pulled that out and tapped into the wires going to the 12v hood vent below the microwave. I was able to easily fish wires from the hood, above the microwave and to the vent. I had to make a small hole above the microwave to accomplish this, but, once the microwave was reinstalled it is hidden.
2018 Keystone Bullet Premier 30RIPR
2018 Nissan Titan XD