Originally Posted by uwe
I am not sure, but that is what I have been told by several towing friends.
It might be aero dynamics.
If the trailer is high in the front the wind will push the bottom of the front of the trailer up. This would reduce the hitch weight and increase the possibility of sway.
If the front is down the wind would push down from the top of the trailer and increase the hitch weight. This would reduce the risk of sway.
It's like when you put your hand out the window on the freeway (not to tell another driver what a great job he is doing). If you keep it flat it stays level. Give it a little up in the front and your arm smashes into the top of the window frame.
This is all theory. I did not go to MIT, but I do have reservations at a Holiday Inn Express this week.