Short-/long-arm suspensions use _______, especially in SUVs and trucks.

Short-/long-arm suspensions commonly incorporate longitudinal torsion bars, particularly in larger vehicles such as SUVs and trucks. These torsion bars provide several advantages for the suspension system. They serve as both a spring and a stabilizing element, offering a combination of flexibility and strength that helps manage the challenges of heavy loads and off-road conditions that SUVs and trucks often encounter.

The use of longitudinal torsion bars allows for a more compact suspension design, which is beneficial in maintaining ground clearance while providing adequate wheel travel over rough terrain. This design enhances both ride comfort and overall vehicle stability by distributing the load more evenly across the suspension components.

In contrast, struts, king pins, and I-beams are associated with different types of suspension systems. While struts can be part of a suspension, they are typically used more in passenger cars than in heavier vehicles like SUVs and trucks. King pins are primarily found in older designs of front axles and steering systems, while I-beams are often used in solid axle setups, which do not align with the short/long-arm design philosophy utilized with longitudinal torsion bars.