What is the recommended action if a trailer starts to fishtail?

When a trailer starts to fishtail, the recommended action is to minimize steering and slowly reduce speed. This technique allows the driver to regain control over the vehicle and trailer combination more effectively. Fishtailing typically occurs when the trailer sways out of line with the vehicle, and making sharp steering inputs can exacerbate the situation, often leading to further instability.

By gently applying the brakes and making small adjustments to the steering, the driver helps to realign the trailer with the tow vehicle, allowing for a smoother correction. It's crucial to remain calm and avoid abrupt movements, which could worsen the fishtailing.

Choosing to accelerate in an attempt to gain control can lead to an increase in speed and further loss of control, while sharp steering could send the trailer into a more severe sway or even cause a roll-over. Pulling over immediately is not always feasible or safe, especially if on a busy road. Therefore, the safest and most effective response is to minimize steering and reduce speed gradually.