The chassis is the foundation of reliability. Prioritize models equipped with Cummins or Yuchai engines, known for high torque and durability. Verify the emission standards (e.g., Euro V or VI) to ensure compliance with local environmental laws. For off-road or rugged terrain, a 6x4 or 8x4 drive configuration is essential for traction, whereas a 4x2 configuration is more cost-effective for paved city roads. Check the PTO (Power Take-Off) integration to ensure seamless hydraulic power transfer from the engine to the crane.