Re:Post 24. In dealing with stability there is positive, neutral, and negative stability. That is, if the object has positive stability it will always return to a neutral condition when upset. An object in neutral stability it remains neutral, that is it won't upset. If the object is negatively stable, which is what we are discussing, the object becomes more unstable and no mater what, it will continue to get more and more unstable (divergent) until a catastrophic event occurs. That is what happens when the trailer wags the tow vehicle with more and more sway. Two solutions to break this increasingly vicious cycle. One, apply the trailer brakes carefully, but not hard enough to lock up the wheels because it is that traction you need to make everything straighten up. That is, you don't want skidding or hydroplaning of the trailer. The other solution is the trapezoid hitch design. Name two un-named brands. There use to be a third called PulRite, but they are no longer made. There is the possibility you could slow down, but going down a grade would rule that out because of the above reasons. Unfortunately, if you have a friction dampening device it can aggravate a worsening condition on slick surfaces. That is why most say to lessen the friction in wet conditions, when you need it the most. Go slow and on dry pavement. If you must travel in other conditions, drive smoothly, steer straight as possible with as little input as necessary. Brake very cautiously and plan every move well in advance.