Routing back up lights wiring

[K1llD4shN1n3]

I'm planning on doing this very soon. I've been unable to find a kit that is designed to use the upfitters, almost all the wiring harnesses I've found include a relay and or a switch. So I'll solder/shrink some waterproof connectors near the tailgate, locate a ground nearby, and run the primary wire through a conduit to the upfitter. Few questions for those who have done this.

• Does anyone know of a harness that I can just buy outright?
  
• If it possible to run the conduit THROUGH the frame instead of securing it to the outside?
• If I tie into the existing backup light circuit AND use the upfitters, can I have the two completely independent of each other without having to run separate wires?

I ran my rear light power and up-fitter wires through frame


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