I have the Thule Roadway bike carrier, and it's a great product, but doesn't include the anti-sway cages.
I bought a pair of these, and it makes a big difference in the left to right movement of the bike. If your bikes are rocking, invest in this product to stabilize them!
Call Customer Service: 888-828-3828
Mon - Fri 8am-6pm CST
Sat - Sun 10am-5pm CST