Just wondering if anyone has added a hitch and wiring harness after they purchased the car and not from the factory. I found an Enclave that had everything except the trailering package and could not wait any longer. Now I have to add one. Any ideas, suggestions? Also is the hitch hidden behind the pigtail or does the pigtail have to be removed once you install a hitch? I saw a picture that looked like a different pigtail than what I have.