Originally Posted by Archicamper
It is a small fraction of the cost of the camper but it is still a lot of money! Is there a real need? Does it matter more in private campgrounds verses state parks or does everyone fell that it is safe insurance just in case?
To your questions...
You can search and read about low voltage, surges and mistakes in wiring that others have run across.
It's not wide spread, but often will happen in very busy parks during very warm weather when everyone is trying to run their ac. One way to protect yourself is with a device that can detect and shut down as needed (like the progressive). Another way is to install an autoformer.
Also, every now and then, a park will expand, upgrade or rewire and the electrician wires incorrectly. Of course, you can avoid these sits by checking the pedestal before you plug in.
A good surge protector checks for these problems before connecting your power.