50 amp surge protectors

The Sola Basic does buck voltage at 135 down 10%. That's not enough to protect from an open neutral. However, I believe that open neutral "feed" to a 30 amp pedestal depends on the campground. In other words, it is their fault. So it should be their dollars to fix it. I also believe it would be an extremely rare event. I always check voltage under load before I plug in my RV.

What is common is low voltage. I've seen 100 volts, unloaded. That becomes a nuisance to the RV owner with disconnects at 102 and 104 (both too low for my comfort zone).