I'll add a little input from the marine world where we have LOTS of redundancy on shorepower for obvious reasons.
You're campsite (dock) SHOULD have a breaker for whatever service you're using (30/125, 50/125, 50/250 being the most common though there are bigger). But some older facilities may not have a breaker at the point of hook-up and instead may have a centralized set of breakers. Uncommon (and probably against code) now but I've seen it plenty of times.
As mentioned, there is a 50amp/125volt service. Looks like the 50/250, but only has one leg keyed instead of two on the 250v. You can google it if you want pics.
On a marine installation, you would have a master breaker at the point of connection to the boat in addition to the point of connection at the dock. Then at the panel you would have another master breaker that shuts down the whole panel. Then you would have your individual circuits with their breakers.
A bit overkill on an RV, but it gives a point of reference anyway.