Jonsie - my wife's 2006 Nissan Altima had the same issue a number of years ago (@ 80 K miles). On her car it sounded like growling, and I initially thought it was cupped tires from an alignment issue. Turned out to be one of the rear bearings. I did both sides and replaced with new Timken units. Quiet as can be after that.
Very easy to do - only 4 bolts hold the assembly in place (once all of the brake items are removed). At the time, I also did pads and rotors since everything had to come off anyway. A year after that, I did the rear struts. That may be what your friend is hearing on the Camry since, with the wheel bearings, it would get louder with speed (mine did big time) ...
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1971 GTO 455 H.O. Ram Air
Nordic Silver - Black
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