I too carry a 30 amp F > 50 amp M dogbone but rarely use it as campgrounds we tend to visit usually don't offer 50 amp service. I also carry a 30 amp F > 15 amp M dogbone for use here in Canada where 30/15 amp service is most common or in the US where it's often 30/20 amp.
The OP said - "the AC was running and the electric hot water heater was on and heating after I took a shower" - but especially during hot weather when we're typically running A/C I normally run the water heater on gas, only occasionally using the electric heating option for quicker recovery time. Doing so reduces the chances we'll ever exceed campsite service and is IMO well worth the minor cost in propane gas used, particularly if I'm mindful enough to turn the WH off during the day when we have little need for piping hot water. Obviously this isn't a viable solution for those who may have an electric only water heater but I would have thought the OP's Winnie would have a conventional gas/electric water heater.
