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For VW hitch >> roof:

http://forums.mtbr.com/showpost.php?p=7451665&postcount=280

http://forums.mtbr.com/showpost.php?p=7448917&postcount=276

Trunk mount is worse than roof - stick with hitch or roof. The goofiest racks I've seen were license plate mount.

Hitch mounted racks require the installation of a bolt-on or weld-on receiver hitch (although there are some ball mount, receiver is way better).

Check hitches for your model at http://www.etrailer.com or http://www.hitch-web.com/

These place carry most brands other than some specialty hitches.

I'd check different model years of the same generation VW model on those websites (sometimes works) or even better - call a bolt-on hitch maker directly (ie curt, drawtite, etc). If they don't make anything check the car forums for a mod or specialty hitch.

Stick with your roof rack if you can't find any real hitch based solution. Trunk racks are less ideal than hitch or roof.

You should change your RM login password, I think you got hacked by one of them chinese nonsense spammers.