The company that built them originally is still in business but doesn't offer VW plows any longer. http://www.snoway.com/ Knowing what plowing can do to a full-frame pickup, I don't think I would want to put one on a VW.
I would go with the caddy so you can put 400 lbs of sand in the back.
maybe if you hit the snow fast enough?
Does the man who drives the snowplow own a Rabbit to help him do his job? Or does he do his job to help him own a Rabbit?