Sturdy, torsion-free, welded steel construction, with rotating top (2 x 90°) and built-in electro-hydraulic module for continuous control of height adjustment. Movable by 4 steering wheels (0 125 mm) with robust elastic rubber tires with splash- and dustproof. permanently lubricated ball bearings, 1 with direction lock and 2 with brakes at the operation side. Tray support with 5 cylindrical transport rollers (lockable), coated with non-abrasive and sound-attenuating PVC, with splash- und dustproof, permanently lubricated ball bearings (0 37 mm, width 470 mm) and 1 stop roller at the operation side. With removable push handle (height 900 mm).