It sounds like you may have lost one leg of the electrical service. Start at the pole and ensure that both sides of the 50amp have 120v. Then to cord, panel, etc. trace from pole through the trailer's electrical system and you should find where it's lost.
Do you have an EMS that could be dropping out?
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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