I just bought my first bass boat. It is a 2008 Triton 17 Explorier. The trailor is painted steel. I was told it was never in saltwater. I took it in for service. The guy gets his pocket knife out and starts tapping on the trailor. He says he can tell the the trailor has been in saltwater because it made a thud noise instead of a Ping type noise. Is this a reliable test. He says the trailor could break apart. Any thoughts would be appreciated. Thanks