They removed the Articulating Pin from the Eze Tow dolly design a few years ago as most manufactures do not have locking steering wheels any longer.
Without the articulating pin, the steering wheel needs to be unlocked for turns. Basically the front wheels are secured to the dolly, the vehicle pivots on the front wheels during turns.
If you go to their homepage at
http://cartowdolly.com , there is a video that shows turns why the steering wheel needs to be unlocked. Starts about 2/3rds of the video time ……