Trailer Sway; What It Is & How To Control It

Jose Adauto de Souza & Mark Polk

Trailer sway, that side-to-side fishtailing movement, (Figure 1) occurs when there is a force perpendicular to the tow vehicle and trailer trajectory, applied to the hitch ball. An important factor in controlling sway is the amount of tongue weight applied to the hitch ball, and how that weight is distributed to the tires on the tow vehicle. A general rule is trailer tongue weight should be 10 to 15% of the fully

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