Just a guess. My uncle jack knifed his brand new 2005 F-350 SRW 4x4 about a month after he got it putting his boat in the water. He did not have a electric brake controller installed and tired it anyway. It was on the boat ramp at a nasty angle. The boat won. Did no damage to the boat or trailer but took out the tail gate and drives side bed.
They called a wrecker down and the guy left. He did not want the liability. We ended up yanking it back strait enough to pull away with my F-350 and a Tundra.
Anyway, he had $3000 in repairs. About $1000 of that was for the tailgate alone.
Chris