What happens if the trailer is overloaded?

The decisive factor is the permissible gross weight stated in the vehicle documents — kerb weight plus payload. Exceeding this limit may result in a fine and penalty points; in the event of significant overloading, you may be prohibited from continuing your journey.

From a technical point of view, overloading is the bigger problem: braking distances and brake temperatures increase, wheel bearings and axles are subjected to loads beyond their design capacity, and tyres overheat. A tyre failure on an overloaded trailer travelling at 80 km/h is a serious risk.

Insurance companies recognise this too: in the event of an accident involving an overloaded trailer, insurance cover may be affected.

Here’s how to stay within the limits:

• The unladen weight and permissible gross weight are stated on the type plate on the frame and in the vehicle documents.
• Bulk goods can be deceptive: one cubic metre of damp soil weighs well over a tonne — considerably more than most people realise.
• If in doubt, drive onto a public weighbridge, such as those at recycling centres or building materials suppliers.
• As well as the total weight, also take note of the drawbar load and the permissible axle load.