I know this thread is kinda old, but I just saw it and wanted to give another idea to you..... I ran my 0/2Guage power cable under the truck, along the frame rail tied in with the factory tail light wires to just under where my amp was going, and poked it up throu a hole I drilled/grommeted to the amp. I ran the RCAs under the carpet to the amp. Just another idea for you to work with. Oh, I used Monster Cable 0/2 Ga cable, and NEVER had a issue withwater, cold or rocks/mud bothering it as I tied it high up on the inside of the [ of the frame.