Sounds like he did his homework (in knowing how to handle his equipment) and was very fortunate. One thing I personally learned was never, never forget to put some type of pin, bolt, or lock on the coupling to avoid the hitch coming off the ball. Just one time I forgot while pulling a pontoon boat out of the water. Got to the top of the ramp, hitch came off the ball and down (into the water) went the boat, motor and trailer. I was fortunate, no one was hurt and no damage was done, except maybe my pride

bill