The links below are my short list (in no particular order). Anyone have any comments in real life usage of them? Any practical considerations you care to share? Advantages/disadvantages? Ease of use, etc.
Bikes to be carried range from 20" kids bike to adult models (four total). Some bikes have cables running on top of the top tube. Some bikes have cables on the bottom of the top tube.
According to tech support, you can use a locking hitch pin to secure the rack to the hitch. You can use a cable lock to secure the bikes to the rack.
Unload bikes in order to use tilt function (like Thule and Yakima models)
No anti-sway required!
Comes with a lock system that secures the rack to the vehicle and the bikes to the rack.
Appears to offer a system that can tilt without offloading bikes first.
No anti-sway protection?
~$180 - $260 (http://tinyurl.com/7ongx)
This one is recommended by my LBS.
The system includes 9' security cable and two keyed-alike padlocks.
No-Wobble system eliminates slack between receiver hitch and rack.
Anti-sway tiedown bar.
The loaded rack tilts for cargo area access. (this suggests that the rack doesn't need to be unloaded before tilting for access to rear hatch of SUV).