Sway bars, or more accurately anti-roll bars, are designed to resist a vehicle's tendency to pitch from side to side during cornering, improving cornering ability and making for a more comfortable controlled ride. Sway bars are among the most cost effective and dramatic improvements that you can make to your vehicle regardless of whether it's a truck, muscle car, tow rig, or RV. Sway bars are also typically easy to install, making them a great first upgrade for anyone who wants a little more control out of their ride.