You might want to check out the racks that Gary Lee makes. The one I purchased from him is extreemly well made and is very similar to the Fiama / Paulchen racks. Normal Yakima bike carriers bolt right up to it, but I use it mostly to haul stuff that won't fit in the van.

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

john