Thanks, guys, for the ideas. That will help narrow it down.
I do need new brake pads. I just had the rear differential lubrication done (that wasn't the problem), so I suspect brake pads or bearings may be a culprit.
As for the sound itself - I guess 'roaring' isn't the best description. The best description I can come up with is that it sounds like normal road noise - like the sound you'd expect from cruising in your car, maybe with the windows open - but magnified many times. We'll see...
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