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You are misunderstanding what that 30 Amp breaker is.
It is a main which protects the the wire and circuit you plug it into. In other words the wire that runs to the plug will not melt if 30 amps is drawn. Draw more than 30 amps and the breaker pops. It also represents the maximum current that can be distributed inside the breaker box installed in the coach. Means the Bus Bar that connects all the breakers can handle 30 Amps.
Now from the Bus Bar there are a number of circuits of lower current typically 15-20 amps for standard plugs and more for high current devices like the AC unit. The breaker designed for the AC unit must not be changed to a different rating. That breaker and the wire to the AC unit must all meet certain rating rules. This means if the AC fails and shorts out the wires all the way to the breaker will not melt or catch fire. If you increase the breaker the wire is no longer protected, it may glow like a light bulb until it melts.
In a coach there are power limits. Running the AC, hot water heater and the microwave all at the same time might exceed the 30 amp limit. This is a good reason why 50 amp circuits are advisable when available.
There is a reason why in a home a 200+ Amp breaker panel is used. Your never going to exceed that rating if you turned on every device in your home.
One more thing - Sockets wear out when plugs are installed and removed over and over again. The weakest part of your connection is at the campground connection box. When you plug in, make sure the connection is tight, if not, get the campground to replace the socket. A loose connection will get hot and you will have a voltage drop that can hurt your devices.
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