When selecting a heavy truck trailer, you must prioritize structural integrity and load-bearing capacity. Key specs include the main beam material, where high-strength Q345B or T700 steel is preferred for its durability-to-weight ratio. Ensure the axle brand is a reputable name like FUWA or BPW, as these are critical for maintenance and parts availability. Additionally, verify the suspension type (mechanical leaf spring vs. air suspension) based on your cargo sensitivity, and confirm the braking system utilizes WABCO relay valves and ABS/EBS for international safety compliance.