I have this sound in the running gear on 'Ol Red. I have the same new
General Altimax RT tire on both of my '88 vanagons - 'Ol Red and 'Ol
Blue - so I decided to swap the the tires between the machines - one at
a time - and see if I could isolate a particular tire/rim. Swap
completed for all wheel/tires and the sound is still there. So it wasn't
in the tires/wheels. So that means???? I can only think of bearings, but
in my experience a wheel bearing produces a distinctive and continuous
growl when it's near death. I have no vibrations, and no pulling one way
or another - so there doesn't appear to be anything bent or out of
alignment. I'm mystified. Any ideas, anyone?

Thanks,

John