Remember, all we're measuring is RMS (Root Mean Squared) voltages - not the actual peak to peak voltage. Any device that can't cut power before the top of the very first cycle allows that full blast to enter your RV.
Surge Protectors and circuit breakers are electro-mechanical devices and will allow a cycle or two at minimum to pass before they open a circuit in the event of a surge or short circuit. For maximum protection, you need to have a fuse protecting the circuit.
Watch this video and learn about the differences between fuses and circuit breakers:
https://www.youtube.com/watch?v=3dckmSgp1nwIt's a real eye opener!