Same sound here, as in sound clip, started at about 9k miles definitely under truck towards rear end I've checked everything , carrier bearing, brakes, park brake, u-joints rear diff oil level, appears ok. Its either carrier bearing or u-joint. Sometimes it lasts a mile or 2 seems worse when...
Backing down out of my driveway turning right the left just touches the front plastic but it's not enough to cause any problems. Could move the crash bar forward but it has to be at that certain angle.
The first picture is the day it showed up in the driveway.
So I started with
Tint
Led headlights
Led fog lights
Ranger inserts on tailgate
1 inch wheel spacers
2.5 level Torque
285 65 18 Terra Hunter
Rough Country bed liner
Trifold bed cover