When sourcing UD Trucks, particularly the Quon or Quester series, you must prioritize engine displacement and torque output to ensure they meet your payload requirements. Look for GH8 or GH11 engines which offer a balance of fuel efficiency and power. Additionally, verify the transmission type, such as the ESCOT automated manual transmission (AMT), which significantly reduces driver fatigue and optimizes fuel consumption. Ensure the chassis strength is compatible with your specific application, whether it be for long-haul distribution, construction, or mining.