Adjustable shocks, such as air shocks, can be used to alter ride firmness and even alter ride height. Reduce body roll while cornering, and help to prevent drift and understeer. They are often available in both stock and lowered vehicle applications, for both the front and rear of your truck. Some trucks include stock anti-roll bars, and can benefit further by replacement with a larger diameter sway bar. Urethane bushings for control arms, sway bars, and frame mounts help reduce body roll and slop.
Old bushings wear out, and create undesirable slop.