PSA - periodically replace your NEMA 14-50 outlet

[nwdiver]

No, I haven't, but I have never noticed a distribution panel (usually at or including the meter and distributing power to several circuits, although it could be a sub panel) in a public facility that allows access by the public to the breakers. Usually a service panel is either inside a locked equipment room or at least its cover is padlocked to prevent unauthorized access.

That's generally not how RV parks work. The panel is almost always (I've never been to a park where it's not) located on the pad. Each pad has its own panel.