We recommend that you conduct the grounding test at the source (i.e., the park's electrical outlet). Even than, you can't be absolutely sure of a good 'safety' ground because a possible loose, intermitent connection or inadequate grounding source, will indicate "ok" even at low current flow. This issue is complicated because a ground is really a safety backup. Even with a faulty ground, no problem will be experienced if everything is functioning correctly with no short circuits.
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Hopefully this helps.
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