I have a Thule rack that will attach to a trunk or hatchback but I don't use it. It is much easier for me to put my bike in the back of my car rather than attaching the rack to the hatchback, then putting the bike on the rack. I'd be afraid to leave the bike rack on the car if I was away for any length of time, and I won't use a roof rack because I know I'd forget the bike was there.