New Hampshire Boating Practice Test

Chains should be criss-crossed to support the trailer's coupler because this configuration serves a critical safety function during a towing situation. The criss-cross pattern allows the chains to act as a cradle for the trailer if it were to become detached from the towing vehicle. This can prevent the trailer from dropping onto the road, reducing the risk of damage and accidents.

When the chains are arranged in a criss-cross pattern, they help to maintain stability and control of the trailer while also protecting the coupler area. This setup ensures that even if the hitch fails, the safety chains will support the trailer in a way that keeps it connected to the towing vehicle, allowing the driver adequate time to react and regain control.

Other configurations, such as using only one chain or allowing chains to hang loosely, do not provide the same level of security. If chains are too loose, they cannot effectively support the weight of the trailer in a failure scenario. Meanwhile, considering the option of not using chains or trailers, this neglects important safety measures mandated by regulations and best practices in trailer towing.