Do all vehicles have a sway bar?

No, not all vehicles have a sway bar, and configurations vary. Most modern passenger cars, SUVs, and trucks are equipped with at least a front sway bar (since front axles experience higher lateral forces during cornering), while many also have a rear sway bar for balanced handling. Some basic economy cars, older vehicles, or specialized off-road vehicles may lack a rear sway bar—off-road vehicles sometimes omit or use disconnectable sway bars to maximize wheel articulation on rough terrain.