My 2014 FC 20' has a "solar prewire" which runs from the front FF vent area to the front, under the bed electrical section. Two No. 10 wires, yellow and green. I have just finished putting on two 100 watt panels and a blue sky MPPT controller. It all seems to work fine. I ran the batteries down a bit, took it out in the sun on a slightly hazy 100 F day here in the NW (and the panels are flat, of course) and got about a 10 amp charge out of it, so about 120 watts. Not bad for a flat set of panels in the heat.
So, the "prewire" on mine worked out well, and saved finding a way to run the wires from the roof to the electrical area. The #10 prewire size is acceptable for a system under 200 watts. The biggest problem was to get the courage to drill the hole through the roof needed to get the wires outside. Because of clearances and so on, I had to go through the plastic flange of the FF vent, but it all worked out well.
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