Josh;

Does you Vanagon have the typical "saggy butt?"  If so, your problem may be
old springs causing the suspension to bottom out when you hit a bump.  If its
not too bad you could throw in an Air Lift kit
(http://www.suspension.com/airliftvw.htm) for about $90.  Reading the
instructions takes longer than the installation.  The air bags will prevent
bottoming out unless the van is grossly overloaded.  They can be inflated
independently to compensate for an unbalanced load (or springs).  I put a set
in my '85 Wolfsburg Weekender a few weeks ago.  The ride is firmer without
being harsh and swaying is greatly reduced.  I can also see farther behind in
the rearview!

Chuck
'85 Westy -- 'Roland'