I recently took my van out to a club site and used the EHU for three days. This was the first time i had used the electric hook up for any length of time and when i tried to remove the cable from the van it was extremely difficult and after a lot of tugging and twisting it finally was removed but the metal pins on the connector had become rough. Any ideas what caused this? Is it safe to use again or should i get it checked by an electrician first.