Can the Total Trailer Mass on the Vehicle License Be Increased?

[StDaniela]

No, it cannot be increased as it violates regulations. Here is the relevant information: 1. Motor Vehicle License: The motor vehicle license is the legal document that permits a motor vehicle to drive on roads within China. The license consists of three parts: the license holder, the main page, and the supplementary page. The front of the main page contains the stamped certificate core, while the back features a photo of the vehicle, sealed in plastic. The supplementary page is the stamped certificate core. 2. Total Mass on the License: This refers to the vehicle's curb weight + approved load capacity + approved passenger capacity (number of passengers in the cabin × standard weight of 65kg per person). Curb Weight: The vehicle's own weight. Approved Load Capacity: The standard mass of cargo the vehicle is designed to carry. For a tractor, the approved total trailer mass refers to the total mass that a semi-trailer can tow.

[MacMatthew]

I've researched the gross combination weight rating before—that number printed in the little blue booklet isn't something you can casually alter. It's like the vehicle's ID number, determined by the manufacturer based on chassis strength, engine power, and safety design at the factory. Those who try to forcibly modify it usually just reinforce the tow hitch or remap the ECU, but getting caught on the road means facing penalties for illegal modifications. Last year, my friend overloaded his cargo by half a ton, which snapped the driveshaft and landed him a 2,000-yuan fine. Seriously considering altering towing specs? You’d first need to apply for a catalog update with the MIIT, undergo a bunch of crash tests, and the whole ordeal would cost well over five figures. At that point, you might as well just buy a vehicle with higher towing capacity.

[Roberto]

I've been driving trucks for almost ten years, and the towing capacity number on the vehicle license is a hard red line. I've seen too many people try to cut corners: some weld reinforced tow bars, others tweak the rear axle ratio, but none of them pass the annual inspection in the end. The DMV's data is locked with the MIIT's official records—no matter how much you modify the cargo box, their system still shows the originally approved numbers. Especially now, with dynamic weigh scales at highway checkpoints, if you're caught with a load 20% over the registered weight, your vehicle will be impounded in no time. Really need to haul heavy loads? Be honest and get a proper truck. Those SUVs labeled with a towing capacity of three tons? They can barely handle one and a half tons at most. Pushing them beyond limits will only speed up engine failure.

[JakeMarie]

Towing capacity data is directly related to the vehicle's safety structure—never modify it recklessly. Once I encountered a pickup owner who welded his own tow hook to pull a yacht, only to find the brakes couldn't handle the load. During manufacturer testing, all parameters are interconnected: braking distance is kept within 39 meters under full load, and suspension deflection doesn't exceed 5mm. If you increase towing weight arbitrarily, downhill inertia can flip the trailing vehicle. Traffic police strictly enforce the figures on the vehicle registration certificate, and insurers are even stricter—claims will be outright denied for overweight incidents. If you genuinely need increased load capacity, it's best to apply for light special-purpose vehicle certification at the DMV, though this is nearly impossible for private passenger vehicles.

[CeciliaFitz]

Last time we handled this issue for a client who wanted to add 500kg of towing capacity to his commercial MPV. Upon disassembling the chassis, we found the OEM frame rail thickness was only 3mm - structural reinforcement would require complete replacement of components. The bigger complication was that the VIN stamping location was on the inner side of the longitudinal rail, meaning any modifications would inevitably damage the factory markings. The DMV officer explicitly stated that unless we could provide a national quality inspection agency's comprehensive vehicle safety re-examination report, the modification registration documents wouldn't even be accepted. Under current stricter policies, unauthorized towing capacity exceeding 10% of factory rating now constitutes the criminal offense of damaging transportation equipment - the risks far outweigh any potential benefits.

[StRowan]

I just finished modifying the towing certification, and the process was incredibly complex. First, I had to find a certified modification shop to reinforce the frame—they had to use special steel with a tensile strength of 900 MPa for the reinforcement welds, which regular repair shops couldn't handle. After the modifications, I had to make three trips to the inspection station: the first to check braking distance (changed from 22 meters unloaded to 30 meters loaded to meet standards), the second for a tilt test (the vehicle must not roll on a 15-degree slope), and finally an emissions test. The whole process cost me 32,000 RMB, but the registration certificate successfully added 0.8 tons to the capacity. However, the inspector warned that such modifications void the six-year exemption from inspections—now it'll need annual testing.