When evaluating 3-wheel wheelbarrows, prioritize the load capacity, which typically ranges from 300 lbs to 1,000 lbs depending on the frame gauge. Ensure the tray is made of heavy-duty polypropylene (for corrosion resistance) or powder-coated steel (for heavy construction debris). The wheel configuration is critical; look for pneumatic tires for shock absorption on rough terrain or flat-free PU tires to minimize maintenance in industrial environments. Additionally, verify the axle strength and the presence of ball bearings to ensure smooth maneuverability under full loads.