Re: High Pitched Squeak
Check the rear passenger door black trim piece above the wheel well. Mine was loose and causing a squeak on rough roads very inconsistently. It was impossible to tell where it was coming from.
I was lucky and discovered it when cleaning the car on the drive way (I was wiping out the inside of the door wells and when my hand when across it the sound was very similar).
Local dealer order and installed a new piece, much more solid and no more squeak.
2011 Jeep Grand Cherokee Laredo 4X4