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The Connecticut RV subpanel uses 50,30,20 amp breakers (not included) inside and I feed it from a 50amp breaker in the supply panel. It's possible that the 50 amp feed breaker might trip under heavy load but it never has. We live in the hot, dry climate near Sacramento so winterizing is not needed but we gobble up kwh during summer AC season.
The breaker in the supply panel is important to protect the wiring TO the RV subpanel. The subpanel breaker only protects the wiring from it to the RV. As we used to say about VW valve adjustments ... I'd rather HEAR 'em (breaker activate) than SMELL 'em (smoke coming from conduit from feed to RV subpanel.
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