When procuring heavy duty racks, the most critical factor is the load capacity per level, which typically ranges from 1,000kg to 4,000kg. You must verify the steel grade, preferably Q235B or Q345B cold-rolled steel, for optimal structural integrity. Additionally, pay attention to the upright column profile and thickness (usually 1.8mm to 2.5mm) and the beam size, as these directly determine the safety factor. Ensure the surface treatment is a high-quality powder coating or galvanized finish to prevent corrosion and mechanical wear in busy warehouse environments.