I wouldn't say it sounded like a Harley as I know what that sounds like since (up north) we had neighbors who'd do what you said and it's not that. To us, it sounded somewhat like some sort of implement machinery or even a plane that was having trouble and flying really low. Don't think it was the latter. Though it did ebb and flow so maybe some sort of vehicle who was driving through our neighborhood. It was loud and mysterious for sure.
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