When sourcing a Yuejin Lorry, buyers must prioritize the engine configuration, typically looking for Cummins or VM power units that balance fuel efficiency with torque. Evaluate the payload capacity (ranging from light-duty 1-3 tons to medium-duty 5-10 tons) to ensure it meets your logistics requirements. Key technical checkpoints include the braking system (Air vs. Hydraulic), emission standards (Euro IV, V, or VI) to ensure local road legality, and the cargo box dimensions (length and volume) which directly impact transport efficiency.