What feature allows the unit to remain stable on uneven surfaces?

The feature that ensures a unit can remain stable on uneven surfaces is oscillating axles. Oscillating axles allow the wheels to move independently of each other, adjusting to the contours of the terrain. This means that when one wheel encounters a dip or elevation, the axle allows that wheel to move up or down without affecting the other wheels, thus maintaining a level platform for the operator. This adaptability to uneven ground is crucial for safety and effective operation, particularly in outdoor environments where surfaces can vary significantly.

While extension bars can provide reach and adjustable height settings can ensure the right working level, these features do not specifically address the adaptability to terrain irregularities. Rough terrain tires improve traction and provide some cushion, but they do not contribute to stability as effectively as oscillating axles do. Therefore, the primary feature that allows for stability on uneven surfaces is indeed the oscillating axles.