If the noise does not occur in coast at 70 MPH it could also be drivetrain related as the drivetrain is not being driven when in nuetral. Possibly trans, rear, bearings. Coming from an old Jeep I have found that different sounds occur in coast and driven situations. My bet...some bearing.
If you wait it will get easier to diagnose.
You do have a cell phone, right?
Good luck!
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