Yeah, I agree. That's usually the way to do it on these trucks. Same trick has worked for GM trucks and a few other vehicles.
I've got a 2011 F150, however all my antennas are NMO mounts on the roof and power is brought in on a heavy cable to a point behind the rear seat (crew cab). I didn't use the firewall path on this truck.
For the power feed, just use the same path as the coax. I don't recall finding a path on the passenger side firewall.
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