Which of the following LCAC characteristics tends to go downhill?

The characteristic that tends to go downhill for an LCAC (Landing Craft Air Cushion) is that it tends to go with the wind. This is because the design of the LCAC includes large, inflatable skirts that sit below the vessel, allowing it to float on a cushion of air. When operating in windy conditions, the vessel's mobility can be influenced significantly by the wind's direction and speed.

When the wind pushes the LCAC, it can cause the craft to move in that direction, which is akin to going downhill, particularly when navigating towards the shore from a body of water. Additionally, wind can impact the stability and control of air-cushion vehicles like the LCAC, making it essential for operators to adjust their navigation strategies accordingly.

In contexts where other options might suggest different characteristics, such as stability advantages or the presence of ballasts, these might typically enhance the vessel's overall operational capabilities rather than directly affect its movement in relation to wind.