The wires from the panels come into the trailer thru the fridge roof vent, easiest place. theres a void space above my fridge so it worked great for my install. my old trailer wasnt as easy. had to fish up in between two wall panels and install controller in the middle of a wall.
as you can see in the first pic, the overhead cabinet, microwave and fridge are all side by side. i pulled the microwave and drilled holes to run two 6 gauge cables, inverter remote wire and 20 amp 12 gauge house hold wire.
after the over head cabinet is the door and i purchased a wire track from lowes to conceal the wiring until it goes into the front door closet. i didnt conceal the 6 gauge wires inside the closet, just tied them down. they go down thru the shelf and into the wall.
on the other side of the wall is a bench for the bunkroom table. i built a wooden box to conceal the wires from bench to bench. thats where the inverter is. i used distribution blocks to tie the 6 gauge wires to the 1 gauge wires coming from the batteries.
here is a good link for a generic panel install