Good question. Being just a bit electrically challenged myself, I can't wait to hear the correct answers.
My solution so far was to buy a surge protector. I wish I had waited a year because right after I got mine they started building a volt meter into the unit. That way if you get interrupted for voltage irregularities you know whether it was for too high or too low of voltage.
And I use a volt meter in the wall outlets to see if the voltage in the trailer jibes with what I assume I am getting at the pedestal.
After that, I don't know diddly. I never have checked the voltage at the pedestal.