The electrical problems found in RV parks are often caused by things after the electric company's service connection. Drooping voltage is most commonly caused by insufficient wiring between the pedestals, not by insufficient capacity from the power company (though that certainly is not impossible). Open neutrals and grounds are in the campground wiring.
House wiring systems are less distributed and involve shorter wire runs and tend to be more reliable. There are situations where some sort of protection for a house is advisable--particularly surge/lightning protection. And it certainly is true that an open neutral in a house can be just as problematic as an open neutral in a campground.
Incidentally, modern electronics are far more immune to moderate voltage variations than some people realize. Many, probably most, switching power supplies these days are rated to operate on anything from 100 to 240 volts. Things like light bulbs and motors and larger appliances are more likely to be affected by voltage variations. (A direct lightning strike is a different matter altogether, and results in much much more than a moderate voltage variation.)