Your entire situation blows, sorry for the issues you have had. I have the sound in my 2015 SLT as well. The sound is not unbearable, only certain times at certain speeds will trigger it. Maybe my ears are not as sensitive to the pressure. My wife on the other hand, who I purchased the truck for, complained about the issue the first time she rode in it. If the rear windows are cracked at all it feels like my ear drums are going to explode. I have not had them try anything yet. The last thing I want them to do is rip the headliner apart if it is not guaranteed to fix the issue. I am about to take it to the dealership, is it a frame issue or is it a suspension issue. Or is there no solution?