We have a PT 50 surge protector and let that check the power at the pole BEFORE allowing power to the camper. It would be a good idea to invest in a "good" protective device. At any rate turn the power at the power pole off, plug in the camper then turn it on. Look for anything unusual like burn or scorch marks around the plug. I assume you do not have a volt meter to check the volts on legs of the 50 amp service. That is so a good investment. Good protection is not cheap.
http://www.progressiveindustries.net/ems_pt50c.htm
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