A trailer ball is a high risk hook point.
Some years ago here, a guy put a trailer behind his car and went up in the hills to cut firewood. When he was full, he tried to cross a small creek and buried it. A guy with a pickup had a recovery strap and tried to help pull him out. He tied the strap to a tow hook on the front of his pickup but there was nothing to hook to on the car so they wrapped it around the front bumper. When he hit the end of the strap, it pulled the bumper clear off the car and threw it through the pickup windshield, killing the driver.
