First off, if there was a power surge, the circuit breaker at the pedestal could care less. It would not have tripped and protected anything. That is why people add surge protectors to their coaches. The park owner was just trying to avoid taking any responsibility for any problems.
ON any 50 amp coach, 220 volts comes in on your electrical cord and is fed to both halves of your 50 amp main breaker. Between the two poles of your breaker it will read 220 volts, but just like in your stick house, the output from each side of the main breaker is only 120 volts. From your main breaker, the power is fed to other breakers in your panel which are used to protect the various circuits in your coach.