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So far as I know, doing this with a single USB bus is impossible; one Kinect will completely saturate the bus that it's on.

Also, there isn't (as far as I know), any concept of "triggering" a Kinect. What you'll need to do is set up a node that listens to both Kinects and implements a synchronization routine (see the approximate synchronization stuff in message_filters). This node would also publish a service that your trigger calls, and then saves the most-recent synchronized pair of images to disk, or wherever else you want to put them.