I believe the Axis/Vegas units do not have the HDMI distribution system some of the larger motorhomes have. Typically they will have a hidden HDMI cable near each TV (for the one above the door that cable is usually in the kitchen cabinet, for the outside TV its in the storage bay below the TV, etc.). My 2014 Axis only has the HDMI cables to plug into and nothing more.
Thus if you want something to play on all TVs at the same time you'll have to work up your own solution.
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