I followed the same path when I installed my Solar panels and ran the panel cables to the front pass through storage area.
From the roof, I went through the refrigerator roof vent which accesses the area behind the refrigerator. You then access these wires by removing the outside wall refrigerator vent cover.
From there I drilled a hole in the right hand corner of the cabinet and ran the wires into furnace cabinet under the refrigerator. You access these wires by removing the wood vent under the refrigerator. I sealed the wires with silicone.
From there I drilled a hole in the left corner of the furnace cabinet which gets you between the floor and the sealed underbelly. I drilled a small hole first then used a long screw driver to poke through the sealed underbelly. I sealed the underbelly with black Eternabond.
So, when I ran the light wires from under the trailer I just followed the same route in reverse.
To get to the monitor information panel to install the switches. I removed the microwave, drilled a hole into the wall behind the refrigerator. This gave me access to the light wires from under the trailer and from the roof. From their I ran the wires through the Microwave cabinet and used plastic conduit in the cupboard next to the information center.
I removed the false wall behind the information center to access the area to wire and mount the switches.
It seems like a lot of work but it's just one step at a time.