What is the primary purpose of bunks on a boat trailer?

The primary purpose of bunks on a boat trailer is to support the vessel during transport. Bunks are designed to provide a stable and secure platform that cradles the hull of the boat. This support is crucial for preventing any movement of the boat while being towed, which can lead to potential damage to both the trailer and the vessel itself. The bunks distribute the weight of the boat evenly, which helps maintain balance and stability as the trailer travels on the road.

While it is true that bunks help to protect the vessel's surface from damage by providing a cushioned support, their main function goes beyond just surface protection; it is fundamentally about the stability and safe transport of the boat. Other components of the trailer, such as wheels and flotation devices, serve different purposes that do not directly relate to the primary function of supporting the boat.