Well I will throw in my experience.
In 2003 we were paving a parking lot for Best Buy on a Saturday where we had bought the asphalt plant to be open. We had scheduled to do 1,800 tons that day. An hour into the paving the paver box went down. Being that we did not have a low boy on the site I went with one of the ten wheelers with a 20 ton tag along trailer to go get another paving box. The only problem was the trailer had steel ramps and we were picking up a paving box with flat steel tracks which equals no grip/traction. To make a long story short loading the machine was an adventure but unloading the 28,000 lb machine was religious experiance. I was inching the machine off slowly and then it instantly slid sideways off the ramps to the ground perfectly with me on it. The best part one of the drivers comes up to me and said "boy you are a brave man Dom for staying on." I had to tell him that I was to slow to jump off.
So the moral of the story is "steel on steel is not a good thing when it comes to trailer loading"
