Did you check the breakers (inside the black panel on the front of the driver's side sofa seat)? If any of them is switched opposite of the others, switch it back.
That would be my first place to look...
2020 T@B 320s Boondock Lite. 2015 Kia Sorrento EX V6 AWD
When you say all else works is that include any other 120v outlets? All the 12v items like lights do not count as they could be running off your battery.
Make sure 120v is actually getting to trailer before going down a rabbit hole.
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That would be my first place to look...
Make sure 120v is actually getting to trailer before going down a rabbit hole.