Further to the current thread about yakima bike carriers:

I recently built a bike carrier for a list member which will carry up to 4
bikes on the rear hatch.
It is basically a frame upon which you attach your own Yakima or Thule bike
trays.  Sort of simulates a bar type roof rack on the rear hatch of the
Vanagon.
The rack attaches to the door only, you can open the door with the rack
attached.  I would say that it is very secure and strong.

See pictures at
http://www.telusplanet.net/public/gary2a/rack/4bike/4bike.htm

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