Controlling Sway Stresses Trailer Frame?

4X4Dodger wrote:
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I am of the opinion that Anti Sway bars are unnecessary. Virtually any trailer properly loaded and properly driven will not "sway"........

I am of the opposite opinion. I believe anti-sway bars are a necessary insurance. Under perfect conditions, they may not be needed. However, driving conditions can be unpredictable and change in an instant. i.e., extremely strong wind gusts, swerving to miss a obstacle in the road or an animal darting across the road, etc. Driving properly is fine and dandy, but also may require drastic evasive actions when lease expected.