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Hi Jim,
I would think a surge suppressor should have saved the appliances that got fried. One other mistake we make in these trailers is putting wooden or plastic blocks/pads under the landing gear and rear stabilizers. That combined with the tires pretty much leave our trailers not grounded except the one little ground wire in the power cable. If we must have blocks under everything, we should run a grounding cable to a ground rod when running 120V power to the units. I know there is times I don't at least leave one part of the gear touching the actual ground, and I know I should.
J&D
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