Best way to get Solar Wires from roof to Basement in Elkridge E292 5th Wheel?

[DIDDLYV]

Still in the planning phase of this project that will eventually end with 4 210 Watt Solar Panels connected 2s each pair connected to its own 40 Amp controller connected to 2 12 Volt DYI Lithium 310 AH batteries and most likely a victron multi 3000 12 to 120 inverter converter. I am rather at a loss on how to get the wires down to the basement. The Std use the Refrigerator vent won't work as the fridge is in a slide out and does not have a roof vent. Looks like the 2 best options might be along side the toilet vent and into the basement. Another alternative is to cut a hole in the roof close to the window in the Bedroom run the wires down that wall hidden with those wire channels one sees hiding speaker wires. There is also the possibility of running the wires into the Closet next to the bed under the bed and into the basement near the foot of the bed. That being the longest run something like 16 ft from hole in roof to the solar controller. The Bathroom vent maybe 12 ft from hole in roof to SCC and the straight down the wall covered by a channel 8 to 10 feet. How have you other folks with 5th wheels managed to run your wires. There is step next to the bed that may well be a channel for running wires from the very front of the trailer to the Breaker panel but would hate to pull up carpet etc to take top off that box for lack of a better term and put the carpet back down. That project might be beyond my skill set to get done neatly unless that is reachable from underneath in the basement.

 

[mopat]

probably run wires alongside vent to basement most reasonable approach