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Hey guys, it's Jake here with Etrailer. Today we have a 2018 Buick Envision. We're gonna be taking a look at and I'm gonna show you how to install the CURT 4-pole trailer wiring harness. Adding a 4-pole wiring harness to your Envision is gonna allow you to safely pull trailers without brakes. If you decide to pull a trailer with brakes, you'll want to add a 7-pole and a brake controller to… see more >
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