you mean something like this?>

http://www.thesamba.com/vw/classifieds/detail.php?id=98448

Unique VW Bus Shortened Trailer-Great Wi - 100 OBO  
This is a shortened VW Bus that is made into a trailer. It was shortened approx 4'. It uses a 2 inch coupler. No windshield. Transaxle has been removed and it tows well. No registration, this will have to registered as a home made trailer. This can be a unique project for the right person.
 
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Date:    Sun, 27 Mar 2005 13:06:49 -0700
From:    jimt <camper@TACTICAL-BUS.INFO>
Subject: 

Has anyone ever tried to convert an old vanagon that still has a good
chassis section to a trailer?  I am looking at a section of the rear from
the bumper mounts up to about 3.5 feet I front of the rear axel.