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I don't know about the frequency of the problem with the electrical system and I don't want to be one of the statics. I had a friend who lost two AC units due to low voltage and the replacement cost was much more than my progressive unit. (he bought one to replace his surge protector).

I also have a dog that I wouldn't want in the heat or cold if there were an electrical problem. So I also have a unit that starts the generator if the electricity fails.

Maybe it's overkill for some people and they have to decide for themselves. I choose the safety side with my choices and in the big scheme of things. I don't see it as and great expense for safety and my peace of mind when you take in to consideration what a person spends on an RV.