What is the approved load capacity of a heavy-duty semi-trailer towing vehicle?
3 Answers
Dual rear axle: 18 tons, triple rear axle: 24 tons. The kingpin position should be calculated according to the towing vehicle. The sum minus the self-weight equals the rated load capacity. For a 6-axle vehicle, the total weight (vehicle plus cargo) is 55 tons, and the maximum load capacity of a semi-trailer does not exceed 35 tons. Additional information: Road regulations specify a single axle limit of 10 tons and a maximum of 55 tons for six axles. Traffic police regulations: The total towing mass is generally 40 tons; subtract the trailer mass to get the payload capacity. For example, if the trailer mass is 8 tons, the payload would be 32 tons. About semi-trailers: A semi-trailer is a trailer with axles positioned behind the vehicle's center of gravity (when evenly loaded) and equipped with a coupling device that transmits horizontal and vertical forces to the towing vehicle. Semi-trailers are typically three-axle and come in various types, such as 11-meter and 13-meter warehouse-barrier semi-trailers, low-bed semi-trailers, etc. They are heavy-duty transport vehicles connected to the semi-trailer head via a kingpin.
With twenty years of long-haul transportation experience, I can tell you this depends on the vehicle type and national regulations. The rated load capacity of heavy-duty semi-trailer tractors is usually marked on the nameplate, typically ranging from 30 to 50 tons, depending on axle configuration, tire load capacity, and chassis design. For example, a six-axle vehicle might max out at 49 tons, while fewer axles mean lower capacity. Overloading doesn't just risk a few hundred yuan in fines—it can cause brake failure or rollovers, and I've seen plenty of tragic cases. National transport authorities determine each vehicle's capacity based on safety standards, so always verify this when purchasing. Recent regulation tightening has caught many drivers who modified vehicles without recertification. Ultimately, load capacity is about safety—don't cut corners for temporary savings. Always confirm the numbers before driving and make regular checks a habit.
As someone who frequently tinkers with vehicles, I believe the rated load capacity is determined by design and influenced by multiple factors. You need to consider axle load capacity—for instance, each axle can typically bear over ten tons. Tire specifications are also crucial, as higher-grade tires can handle heavier loads. Additionally, the suspension system and frame materials play a role. The gross vehicle weight is usually set around 40 tons, and you can test it at a weigh station during actual measurement. Exceeding this limit accelerates component wear, may cause engine overheating, and won’t save money in the long run. I recommend checking the nameplate information at a 4S shop or professional inspection station. From a technical perspective, newer models using lightweight materials are seeing improved load capacities, but accurate data measurement is essential before any modifications to avoid on-road risks. Regular maintenance of tires and the chassis can extend their service life.
