In a message dated 6/29/2011 1:42:47 A.M. Eastern Daylight Time,
greenvanagon@GMAIL.COM writes:

Regarding adding a 5th seat to a westy...

supposedly these  5th seats really exist.  Gary even has a photo of one on
his website,  just to prove that they  do:
http://www.telusplanet.net/public/gary2a/rack/5thseat/5thseat.htm

Notice  how it folds up.  Neat!

theyre just jumpseats from vanagon Carat/wolfsburg models.  you can  mount
them in any vanagon.