It's all about insurance. Just like your PC at home that probably has one and is sensitive to power surges/outages, the surge protector should protect from surges in power.
Many campgrounds don't have perfect or reliable power. When we camp at some higher end places, my tester (not the surge protector) says all is good. Some of good ole IL state parks are iffy. You'll find comments here on RV.net about wrongly wired outlets, etc.
It's really all about peace of mind and insurance. To hopefully protect you from disaster. Compare pricing on Camping world, Amazon, and your local RV dealer.
