I second Karl's diagnosis. I've had that clunk and found the upper bolt on
the rear shock was loose. Scary noise but easily fixed.

John Meeks
'91 Vanagon MV Phoenix
Northern Michigan

Vanagon Rescue Squad <http://www.vanagonauts.com/Vanagon-Rescue-Squad74.htm>
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On Wed, Jan 30, 2013 at 7:31 AM, Arlene K Sondergaard <asonder@usgs.gov>
> wrote:
> >> On the freeway this morning the passenger side rear wheel clunked like I
> >> hit a rock.
> >> What can be going on?
> >> Wolfsburg 1987 Van
>