When selecting a transportation truck, you must prioritize the Engine Performance (Horsepower and Torque) to ensure it meets your load requirements. Key specifications include the Emission Standard (e.g., Euro IV, V, or VI) to ensure environmental compliance, the Payload Capacity, and the Axle Configuration (e.g., 4x2, 6x4, 8x4) which determines stability and weight distribution. Additionally, verify the Transmission Type (Manual vs. Automatic) and the Fuel Tank Capacity for long-haul efficiency.