Yakima Bike Rack
Best Rack I?ve found on the market. Really easy to attach to a hitch, can fold back when no bikes are on the rack. An extension can be bought and attached to the initial bike rack so 4 bikes can be transported.
Don?t hesitate buying it, although a little too expensive.
Add on/extension link: http://www.backcountry.com/yakima-hold-up-plus2-add-on?wallE=1&_requestid=1217713