I posted this thread under a different category before I found the Towing category - sorry ! I've got a 2007 Acadia with the factory towing package , but I've never towed anything with it. Now I am going to borrow a pop up camper and after reading some threads I've got the feeling that the rear wiring outlet might not be activated even though I've got the factory tow package? Is this true? The camper has a flat 4 wire so I had to buy a 7 pin to flat 4 converter and I want to make sure I can just plug this thing in and it will work before I drive out to pick up the camper and find out the lights don't work. Any info is appreciated !! thank you. ???