You might want to check both the connection at the pole and the innards of your 50 amp plug I had the same thing happen only to discover I had corrosion within the plug and although the coach was pulling less than 50, the added resistance at the plug was driving the breaker at the pole into overload.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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