When sourcing garage storage racks, the most critical factor is the load capacity per layer, which typically ranges from 200kg to 1000kg for industrial-grade units. You must verify the gauge of the steel (e.g., 1.5mm to 2.0mm thickness) and the type of finish; powder coating is preferred for its superior corrosion resistance and durability in humid garage environments. Additionally, ensure the racks feature boltless assembly designs for ease of installation and adjustable beam heights to accommodate varying cargo sizes.