Closest I've seen to the classic pre-vanagon roofrack that bolts right
on is to use Yakima crossbars and their ridiculously named and overpriced,
but burly and cool-looking "Megawarrior" (larger version of the "Load
Warrior") basket with or without extention.  I try to buy Yakima stuff on
Ebay; it's almost affordable used, and it generally ages well. If you are
handy, you could modify an earlier VW rack or an old Land Rover 109/110
station wagon rack.  Also, a shop that sells ladder racks and such for
commercial vehicles may have something.  I use Yaks and a Rocket Box up top
for messy or dangerous items (potential projectiles in an accident) but
otherwise try to keep my loads packed as low as possible.
-chris

P.S. Has anyone else met or hung out with Land Rover people?  I have found
more Classic style series Land Rover folks around Hartford, CT than Vanagon
people, and I don't even have a Land Rover!  Generally seem pretty nice, and
great for tire and off-road info. When I get my Syncro set up, I'm gonna try
to beg my way into one of their off-road excursions.  Eccentricity rocks!