Installing a rear cam for a dual-channel setup (routing question)

[stresstest]

For those of you that have a Blackvue or Thinkware (Or other dual channel) dashcam. How did you route the USB cable to the rear cam? I want to go through the headliner but the curtain bags have me concerned. Did you go down the A Pillar and run along the floor or if you went headliner, how did you do it?

My cam gets here today so I'll want to get on that install right after work.

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[myjaja]

You don't have to go through any pillars. I tucked mine from all the sides under the headliner. You can tuck in the wire where the weatherstripping meets the headliner.