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First I assume you have 50 amp plug on your trailer.
Check the two 50 circuit breakers to make sure they are not tripped. Actually turn them off and then back on.
If no luck then you have to do some voltage measurement with live wires. If you are not comfortable with this then "DO NOT DO IT" and let an electrician do it for the trailer and your safety. The reading I would take is on the input for the main circuit panel.
If no voltage then check the plug where you plug into the trailer.
Good luck and let us know what you find.
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