I've never heard this at all. Can you give a source for that information?
Wheel bearings and u-joints don't really make the same noise when they fail. U-joints get clunky during gear shifts, and can cause a vibration. Wheel bearings, at least the rear ones with big ball bearings, tend to get loose before making lots of noise, allowing the wheel to move side-to-side and up and down and clunk a little bit, I believe. You can jack the back up and lift and tug on the wheel to test the wheel bearings. Crawl underneath and visually examine and pry on the u-joints. There should be zero play.
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