I like the simplicity of the hitch mount ones. However, I was driving in a light rain the other day and the bikes would have been very dirty. That made me think the hitch would not be the best. I like the hitch mounts with the trays for the wheels. The only thing I was wondering about that is if I got the extension for another 2 bikes (a total of 4 bikes) how far out would the bike be hanging behind the car. My guess if pretty far.

Whenever it is just me and my bike I fold the seats down and put it in the back. Very easy. When it is 3 people with bikes and gear all in the car it starts to get to filled up.