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J&D,
You have a false sense of security that the landing gear or jacks serve as ground. Ground is not achieved until you are a minimum of 36" in the ground and then it must be verified by testing. The trailers are not designed to be grounded to earth, rather to themselves like an automobile. When connected to an external power source such as your pedestal, the ground cable in the cord serves as ground to the parks system. By adding a ground rod, you might actually be causing more risk for yourself in a lightning storm, as the trailer is not designed to absorb lightning to earth ground.
Jim, - I doubt the park service would be capable of providing 240VAC to one of your circuits, however - a momentary loss of the neutral can cause erratic voltage across both circuits. I don't know if a surge suppressor would prevent damage from that type of occurance. It would be interesting to know.
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