Hey Pittsburgh,
I was pouring concrete in two different locations in a small town a few weeks ago. This town has intersections with humps in them, and the water drains on through the intersection. My helper was in the truck with me and we had the dump trailer on and were going over a hump and into the trough. He said, "big bump ahead" and then there was a big bang.
The receiver was held on my F250 with four big bolts. The rear two had snapped and the trailer was dragging on the receiver, which was on the ground. I jacked it up and left it and we did our second pour and I had it repaired the next day. They welded the heck out of it this time.
So get a good receiver and make sure it is attached securely. I was towing up to 6 tons in the dump trailer, plus the weight of the trailer.