How do I calculate a Vehicle’s Towing Capacity?
Details of the towing capacity for your vehicle that are found in the owner’s handbook, the manufacturer’s website and also on other websites should only be taken as a guide. The actual, exact and only towing capacity figure that should be used for your vehicle is the one that is stamped on the Vehicle Identification Number Plate, VIN Plate. The VIN plate will display either 3 or 4 sets of weights, it is these weights that VOSA or the other vehicle authorities use to determine whether your vehicle is towing or being driven within the law.
The top figure is the gross vehicle weight, the Maximum Allowable Mass (MAM) of the vehicle including occupants, fuel and payload. The second figure is the gross train weight, this is the combined maximum allowable mass of the vehicle and trailer. The third and fourth figures are maximum axle loads front and rear respectively. The manufacturer’s recommended maximum towing capacity for your vehicle is the gross vehicle weight subtracted from gross train weight. See equation below. However if your vehicle is not approved by the manufacture to tow then the second figure may be blank, displayed as 0000Kg or it may equal the weight of the gross vehicle weight.
4200kg – 2505kg = 1695Kg
Certain performance, hybrid and city-car models or similar variants of standard models are not homologated to tow, this means that the vehicle manufacture has deemed that the model is unsuitable for use as a tow vehicle. With this type of vehicle the towing capacity will equate to zero or a gross train weight will not be displayed. Sometimes this can be due to a weaker gearbox, smaller radiators and brakes for example.
If you have any questions relating to towing weight please email us via the contact us page with a photo of your VIN plate.
