I needed to use a trailer to get a old truck from a friend. I borrowed one from the place that I was working and pulled it home with the company 1/2 ton truck. The company truck had a reese hitch and two inch ball with no trailer brakes. The trailer was empty but stilled weighted about 2500 lb. I was going to use my 3/4 truck (with trailer brakes) to go get the old truck. I could not read the size of the trailer coupler on the coupler. The area that it was printed was damaged. When I connected it and pulled it up and down to make sure that it was okay it seem to be fine. However when I hit a bad bump at 65mph, I looked in the rear view and here was the trailer traveling sideways behind me still attacted by the safety chains. WEEEEEE... what a ride.

I took up both lanes and the brake down lane to get it back under control. Then I eased it over into the grass and let the grass slow me and the trailer down to a stop. The trailer turned out to have a 2-5/16 coupler. Because the truck had about 800 lb on it and the trailer was empty I was able to save it with a bit of luck. (lucky no one was next to me)

The only damge was a small dent to the truck rear bumper and new underpants for me. I moved most of the load from the back of the truck to the trailer tongue. Then I drove slowly to the next exit and found a auto parts store that sold me a 2-5/16 ball.
Anyway all my trailers now have 2 inch balls, and all my furture trailers will have 2 inch balls. I also bend down now and look under the coupler to make sure it is tight and not just bonce it up and down. I also use a pin to make sure the coupler is locked down.
One more thing: If I had trailer brakes then I could have lock them up and the trailer would have stopped me in a controlled straight line. A brake away kit will do the same thing. I now have one installed on my car hauler.
David.