What is a vital safety measure before towing a heavy trailer?

Confirming that the load weight is within limits is essential for safe towing practices. Excess weight can significantly affect handling, braking, and overall stability of both the towing vehicle and the trailer. Each vehicle and trailer combination has specific weight ratings, including Gross Vehicle Weight Rating (GVWR) and Gross Combined Weight Rating (GCWR). Exceeding these limits can lead to dangerous situations such as trailer sway, reduced braking ability, and potential mechanical failures. Properly assessing and confirming the load weight ensures compliance with safety regulations and helps maintain control during transit.

While checking the weather forecast can help prepare for changing conditions and managing driving risks, it does not directly impact the mechanical stability and safety of the vehicle and trailer. Ensuring that all windows are closed is a matter of comfort and minor convenience, and activating dome lights is not relevant to the towing operation's safety measures. The focus on load limits is crucial for establishing a safe towing environment.