I had a 2015 forest river greywolf trailer that had a 12v socket next to the tv mount. I used a 13" tv that came with a inline transformer to input 12v to the tv. Used a car adapter and ran it off the 12v. I don't think that they make any larger tvs that way.
My 2017 outlaw has a invertor that powers the three ac recepticals for the tvs. Invertor has a internal transfer switch so I only need it when boondocking
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