Don't you remember when trucks had real bumpers and how rough they were treated ??
I remember that. I remember helping an older gentlman change a tire on the side of the highway when a guy in a truck came around the corner, hit the brakes, had his trailer rip the center section out of his bumper and cut the older gentleman I was helping in half against his car.
The ball was still attached to the trailer and the safety chains just tore the holes out.
I won't tell you not to bumper pull a trailer because it is technically legal. At the same time, I will never do it and no one will do it with any of my rigs.