To correct trailer sway, one should use:

To effectively correct trailer sway, using the trailer brakes is a sound strategy. When a trailer begins to sway, applying the trailer brakes can help bring it back under control by reducing the speed of the trailer independently. This action can help to realign the trailer with the towing vehicle, as slowing down the trailer allows it to stabilize and reduces the momentum that is contributing to the sway.

Utilizing the trailer brakes is particularly advantageous because it targets the source of the instability directly. The use of these brakes can help create a controlled deceleration, which can eliminate or reduce the sway action, ensuring a safer towing experience.

In contrast, using engine brakes may not effectively stabilize a trailer, as their engagement would primarily affect the towing vehicle without directly addressing the momentum and balance of the trailer. Tow truck assistance might be necessary in extreme situations but is not a practical solution for immediate correction of sway while on the road. Speed adjustments can be helpful, but they are often less effective than directly applying the trailer brakes, particularly in situations where swift correction is needed to regain control.