a little more to my response. ON the toad,. How do you carry the bike to a ride? I assume by you calling it a road bike, you are in the more dedicated ranks of cyclists. I have a road bike and a mountain bike, and my mountain bike weighs less than the department store road bikes. I have a Yakima roof rack and what they call a 'front end loader' rack, it is adjustable to wheel size and is very easy to load. It comes with a built in heaven duty cable lock for security and it also locks to the roof rack.
Better than hanging from ladder, in the case of multiple bikes, you can just add another rack.
The hitch mounts are another good option, but putting more items between the car and hooking up is mot my idea of fun trying to get =everything settled.