Surge Guard diagrams
We had a Surge Guard 30 Amp Portable Surge Suppressor (shown on the left above) for many years. A few years ago our trailer got hit with a bad surge. The surge suppressor took the hit and had to be replaced, but the trailer and electronic devices were well protected and unharmed. In other words, it did what it was supposed to!
When updating this article, I found that they now had a newer model. Unfortunately, there are a lot of complaints about it on Amazon. I did some research and came up with a device that operates and looks almost identical to our original one. It's called a POWSAF RV Power Defender and it has a lot of good reviews.