What is a common feature of a skid landing gear?

A common feature of skid landing gear is that it is typically constructed of rugged materials such as tubular steel supports. This construction method provides the necessary strength and durability required to withstand the impacts and stresses during landings, especially in potentially rough terrains where skid-equipped aircraft often operate.

The choice of tubular steel allows for a strong yet relatively lightweight structure that can absorb shock and distribute the loads effectively while maintaining the aircraft's stability during ground operations. This type of landing gear is commonly found on helicopters and certain types of aircraft designed for operations in remote locations with minimal infrastructure.

In contrast, the other options do not represent the fundamental characteristics of skid landing gear. While some aircraft may feature spring-loaded suspension systems or retractable designs, these are more aligned with other types of landing gear, such as tricycle or tailwheel configurations, which aim to enhance aerodynamics or improve handling characteristics on conventional runways. The emphasis on two wheels for balance does not apply here, as skid landing gear typically does not utilize wheels at all but rather relies on the skid itself for landing and takeoff operations.