Sounds like you have lost one side of your service or a full circuit.
Here are some other possibilities to those above for a bad leg on the service. They assume your service at the pedestal is good. They are in logical/methodical order.
30 amp adapter, if used, is defective - try another one
50 amp cable is defective - test with multi-meter if you know how or have it checked by someone who does or try a different cable
Plug on trailer is defective - test or have it checked
Service feed in trailer is open on the bad leg - test at distribution panel or have it checked. If bad, a trace back to the open connection/wire is necessary.
Main breaker is defective - check or have checked
These are logical steps for a circuit issue
Defective breaker for the circuit. If all the non-functioning items are on the same breaker - test that breaker or have it checked
Open circuit wiring - test or have checked beginning at distribution panel for loose connections and working outward to test any junctions.
This would be my approach but there other ways that someone more experienced than me may suggest
Flickering lights are a danger signal. They may indicate loose connections which can caused overheating, arcing and potentially fire.
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