I owned the WT-4 wireless unit a few years ago and tried to use it on my D3 and notebook computer for tethered use in the field. It was difficult to install (Windows platform), but I finally got it working. I used it a couple times and gave up because it was simply much to slow, compared to a USB 2 cable connection. As I recall, it took about five seconds for a RAW file to transfer using the USB 2 cable, versus almost a half a minute wireless. I finally gave it away.
I have no experience with the Mac platform, so cannot offer any suggestions. Other members may be able to help.
For field use, I have a dolly with my tripod mounted on it, and an accessory arm on the head. One side of the arm has a tray for the notebook computer, and the other side can hold one or two cameras. There is a second tray on the dolly that holds a custom battery that I had built that will drive the notebook for several days as full screen brightness. Everything I need can be rolled around sidewalks, parking lots, etc. without worrying about tripping over anything.
If you are interested, I will post a couple images of this configuration.
Thanks again for joining us.
HBB in Phoenix, Arizona Nikonian Team Member
Photography is a journey with no conceivable destination.