Best route to wire from interior cab to the bed?

[Cyberbully]

I need to run some speaker wires from the rear seats into the truck bed. What’s the best/easiest route for them? Is there an interior plug or place on the rear interior wall to pass thru wiring?

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[hemiarch]

The issue is the tonneau so you cannot go directly back but you can go out the car by the cantrail and then aft until you get to the side of the vault and go into it thereby basically bypassing the tonneau cover which rolls up between the cab and vault.