I like to get a backup sensor installed in my Traverse. I am looking at purchasing the electromagnetic backup sensor which does not require any drilling. The backup light is on the trunk lid which make it quite difficult. Does anyone have installed the aftermarket backup sensor and care to share how this is done from unhooking the bumper to indentifying the wiring? Any assiatnce is greatly appreciated. I love my new Traverse but backing up is quite difficult without the sensor. Cheers!