Mechanical Engineers Primary Responsibilities: Design and develop structures, subassemblies, and mechanical components of truck and trailer bodies or ambulances using CAD software (Solid Edge, SolidWorks or AutoCAD Inventor preferred). Physical Demands: While performing the duties of this job, the employee may be required to routinely sit, stand, walk, talk, and hear, use hands and fingers to keyboard, turn handles, feel, stoop, kneel, crouch, twist, crawl, reach, and stretch.