Advice from new Winnebago owners?

I'm parked by another unit, and watched them change out the 50amp male and female plug. Said he had been at a camp ground where the electricity would go off and on about 3 times per day. He had to protection, and both male and female were burned very bad. He was lucky the entire unit didn't go up in flames. Breakers at park and trailer never flipped. I showed him my serge guard. We;ll see if he gets one.