<< the plywood subfloor in a westy is substantial enough to do the job
without all the extra work of ripping up the floor and welding in those
metal
cups.. >>

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Here is a picture of the floor with the metal inserts.  Also pictures of the
5th seat in a westfalia.
I don't have a picture of the metal bracket under the floor however.

> http://www.telusplanet.net/public/gary2a/rack/5thseat/5thseat.htm  <

Gary
http://www.telusplanet.net/public/gary2a/rack/vanagonrack.htm