External Monitor on Road Hog

I purchased a VGA to USB adapter to connect an external non-touch LCD screen to my Road Hog. I plugged the adapter into a powered USB hub and then into the Road Hog. I can't get it to recognize the screen.

Is the VGA to USB adapter proprietary to the Hog? My dealer told me I could buy any adapter and didn't have to purchase the one from High End.

What am I doing wrong?
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