One of the challenges of sprayers that steer like a zero turn with free spinning front casters is that it can be hard to keep them on a straight path across slopes. To address this TORO's front casters can be locked from free spinning by the operator depressing a foot pedal once the sprayer is on the correct heading.
The SprayMaster lineup consists to two different platforms. The LTS (Lean to Steer) model # 34230 which has single tank and steers with one hand by rotating the angle of the front wheels. And the Spray Master Z-Spray models which have dual tanks and dual hydraulics which steer much like a zero turn mower.