Bus Tub Trolley

Three-tier clearing trolley on castors with a push handle, carrying a plastic bus tub on the top tier and stacked plates below; knobs for tier count, load state (empty, cleared crockery, full tubs) and frame finish.

风格：low-poly, flat-shaded vertex colors, no textures, single shared material, so any set of these merges to one draw call; shares palette and scale with its kit