Kent,
Your answer is that you will need a "top tube bike frame adapter" for any hitch or trunk rack you use. Ever manufacturer makes one. I've included a website that has one by Yakima for $27.00. This site is the cheapest I have found on racks.
I know the answer to your question because I have been researching the same issue. This fix works great.
http://www.orsracksdirect.com/yakima-8002531.html