RockyMounts gives you the Tandem TailPipe.  The easy to load, locking hitch rack for your bicycle-built-for-two.

Product Features

• Secure Locking System Included:  Lock rack to car and bikes to rack with same key
• Fits both 2 inch or 1-1/4 inch hitch receivers (Class II receivers or higher)
• Easily and securely installs to 1.25″ or 2″ car hitch receiver
• Anti-sway arm keeps the tandem stable while driving/braking.
• Arms fold down when rack is not in use