My first check would be to replace the circuit breaker. It sounds like you started with a "weak" breaker that continued to malfunction until it finally stopped working.
Essentially, power comes into the trailer "buss bars" and from there, through the circuit breaker to the ROMEX and finally to the outlet. All the outlets are "connected in series" so a loose wire in one of the "knife connections" on the back of an outlet will interrupt power to the remaining outlets further "down the line"....
However, given the way you described the issue, I'd focus first on replacing the breaker, then on checking all the electrical connections behind each outlet that isn't working. My bet: The breaker is either bad or has a loose connection.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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