I just finished a job with 2 RK3, 5 T2CZ, and a T3VZ. All work great.

I recommend you just copy the list from the "Escient sample" file that RTI has. It works great. And also use the "system state" text variable somewhere on the iPod page of your screen. This will show if the dock is syncing/ready/error/offline, it gives the user a little feedback that the dock is doing something instead of just guessing that it is broken.