When sourcing cart trolleys, the most critical factor is the Load Capacity, which typically ranges from 150kg to 1000kg depending on the frame reinforcement. You must verify the Material Composition; for heavy-duty use, 304 Stainless Steel or Reinforced Carbon Steel is preferred for durability, while High-Density Polyethylene (HDPE) is ideal for lightweight, corrosion-resistant needs. Additionally, pay close attention to the Caster Specifications—ensure they use Precision Ball Bearings and materials like Polyurethane (PU) or Thermoplastic Rubber (TPR) to ensure noise reduction and floor protection.