What does it not ensure if you only increase the line size while towing?

Increasing the line size while towing primarily affects the strength and durability of the towline. However, it does not ensure the ability to tow beyond the design characteristics of the vessel or the towing setup.

The design characteristics take into account various factors such as the vessel's hull design, its engine capacity, and overall structural limits. Simply increasing the line size does not change the fundamental capabilities of the vessel or its design specifications. Therefore, one may still be limited by the vessel's inherent characteristics regardless of the size of the line used, as these characteristics dictate how much weight or force the vessel can effectively manage while towing.

In contrast, increasing the line size can contribute to increased safety, improved stability, and potentially enhanced speed, but these improvements depend on many additional factors beyond just the line size alone.