After using one of the trunk mounted racks for a couple years, I finally bit the bullet and had a receiver installed onto my Accord and I bought a Thule T2 tray rack. The tray folds down, you set the bikes on and they are secured by the wheels. Easy on, easy off. Nothing touches the bike frame, and there is no rubbing or scratching. My skinny tire road bike and my fat-tire full suspension mountain bikes fit equally well on the rack with no adapters. Built in locking cables to deter the casual thief while you take that quick bathroom break. Not cheap but completely worth the expense IMHO.