When sourcing a bath shower trolley, prioritize 304-grade stainless steel or powder-coated aluminum frames to ensure maximum corrosion resistance in wet environments. The mattress or liner should be made of high-density PVC or EVA material that is biocompatible, waterproof, and easy to disinfect. Look for a safe working load (SWL) of at least 180kg to 250kg to accommodate bariatric patients, and ensure the hydraulic or electric lifting mechanism provides a height range of approximately 500mm to 900mm for ergonomic caregiver operation.