This is not exactly what you are asking about, but I use this Saris bike rack on my car. It also has it's own stand and can be used to store your bikes indoors as well. The larger size will take up to 3 bikes (30 lbs per bike). If you happen to also be in the market for a rack, this might work for you. I love mine because it is so light compared to other hitch mount racks.

http://www.youtube.com/watch?v=6EG0WeNbOgk