Most modules that allow for in-motion are an in-line set-up that go between the MkIV and the OEM video module. It basically filters the i-bus signal that tells the video module that you are going more than 5 MPH.
The only real difference in the kit you see on eBay and TVonNav's is 1) the eBay kit appears to include the OEM TV antennas whereas TVonNav had an aftermarket antenna, and 2) the eBay kit does not include the in-line module to allow it to work while in-motion.
You'll have to check around to see if you can find one of these in-motion modules.
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