When evaluating stretcher beds, prioritize load-bearing capacity, which should typically be at least 250kg (550 lbs) for standard models and higher for bariatric versions. Ensure the frame is constructed from high-strength aerospace aluminum alloy or powder-coated steel to balance durability with weight. Key functional features must include hydraulic or electric height adjustment, Trendelenburg/Reverse Trendelenburg positions, and collapsible side rails for patient safety. For emergency use, verify the presence of central locking systems and directional castor wheels (ideally 150mm-200mm in diameter) to ensure smooth transit through hospital corridors.