When sourcing a used container stacker (Reach Stacker), you must prioritize the lifting capacity (typically 45 tons for the first row) and the stacking height (usually 5 to 6 containers high). Critically examine the engine brand and condition (e.g., Cummins or Volvo), the transmission system (e.g., Dana or ZF), and the hydraulic pump performance. Ensure the spreader functionality is smooth, as this is the most active component. Always request the total operating hours; machines with fewer than 10,000 to 15,000 hours are generally considered to have significant remaining service life.