The 30A part of campground pedestals (breaker and receptacle) really get abused. RVers plug in and out with a load applied and that scorched the receptacle. They turn the breaker on with a load on it and much of the time the load is right at max. Also, at last by my understanding, the average breaker isn't meant to also be used as a switch. Far as I know the pedestals use those breakers, not the more expensive switch-capable ones.
Remember, when you plug into one side of 50A, you're plugged into 50A NOT 25A. You're also using more robust receptacle and plug. Problem when I do that is the Adapter-to-RV Shore Tie connection gets hot.