I have developed what sounds like a plastic squeak when going over rough roads. Its somewhere around the drivers side rear door. I have removed the weather strip, B pillar and plastic pannel covering the drivers seat belt. Ive had my hands all around the twin panel sunroof in the rear as well. I cant find this rattle at all and im pretty good at finding them. This is the first ine thats stumped me. With everything removed it definately appears to be coming from the top part of the door or roof. Ive read a couple ppl with this issue on a raptor and a regular 2016 f150. Would love a solution from you guys.