When evaluating a used live floor trailer (also known as a walking floor), the most critical component is the hydraulic drive system (e.g., Keith or Hallco). You must verify the cylinder seals for leaks and ensure the moving slats (floor profiles) are not excessively worn or warped. For high-impact loads, check if the trailer has heavy-duty floor slats (6mm to 10mm thickness). Additionally, inspect the subframe for stress cracks and the sidewalls for bowing, as these trailers often carry high-volume, abrasive materials like mulch, waste, or agricultural products.