Tuga, at the time, I was using a Hughes Autoformer, which has reverse polarity protection by taking out its input diode pack. I regret to say that currently I am not running surge/polarity protection. I do take the precaution of leaving the manual transfer switch in the off position when I plug in. Then I check the polarity light before I change the manual transfer switch to Shoreline. Since the newer Newell all have automatic switchover, this approach wouldn't work for them. I have just been lucky on the surges so far. I would certainly consider the Progressive Industries model.
Newell includes surge protection on all their new coaches. You might check with them to gain the wisdom of their experience.
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