Plug looks like a water heater plug. Or the antifreeze "injection" point plug.
The extra HDMI cable may be just for your use. Many campers come with a compartment or shelf for a video game, DVD player, or computer and provide an HDMI cable to plug into. On the Axis/Vegas units there is a shelf above the kitchen with an HDMI cable that runs to HDMI input 1 on the TV.
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