I use the X-Port two bike tray style hitch rack from Performance. I read somewhere that hanging a carbon bike from its top tube isn't recommended. True or false, the tray style works for me. The only con with a hitch mounted rack, particularly with a tray style, is that if a car taps the rack (it can happen when parking) it could go a bit out of alignment (easily fixed) making it temporarily more difficult, but not impossible, to use.