I have a Sportworks hitch mounted bike rack (just found out they sold their consumer division to Thule). Here is the link:
http://www.thuleracks.com/thule/product.asp?dept_id=8&sku=260120
This is the best bike transport system out there. I had the Yakima Kingpin and it was a piece of you know what. Question for you: How are you going to get your bike on top of your H3? Hope you have a light bike.