Surge protectors and Joules

Other than lightening I would think that large inductive loads starting and stopping would be most likely to produce a surge. If you're in a small rural campground it's probably less of an issue then if you're in a campground closer to large industry that may have large motors. Campgrounds near amusement parks and water parks would likely be more susceptible to spikes form all the ride and pump motors.
However, some campgrounds may have some rather large motors on pool pumps, well pump, sewer treatment pumps, etc.