Wire routing

[Jb70c10]

How are all of you routing your wires from your battery to your amp mounted behind the seat? If you come thru an opening in the firewall do you route the wire along the outside of the cab in that little channel where the dome light wire runs or just across the cab floor under the carpet? Cab floor I'd cover with dynamite type material. Just want to know what the best way to route the big 4 ga wire to where is does not show and won't cause a big lump in the carpet