For your safety and the safety of other road users, it’s critical to know your towing weights and making sure you are towing under your maximum limits.
VEHICLE WEIGHT DEFINITIONS
TARE: Tare Mass: The weight of the trailer or caravan at the completion of manufacture, empty with no added accessories or fluids and unhitched form the tow vehicle.
ATM: Aggregate Trailer Mass: The “allowed total weight of the trailer or caravan specified by the manufacturer when fully loaded and unhitched from the tow vehicle.
GTM: Gross Trailer Mass: Total weight of your trailer or caravan when fully loaded and atatched to the tow vehicle.
GCM: Gross Combined Mass: The combined weight of your tow vehicle AND trailer or caravan when hitched together and both are fully loaded.
TOWBALL WEIGHT: Downward force/weight of the coupling onto the tow vehicle’s towball.
ATM – GTM= Towball Weight.
Example: ATM of 2890kg – GTM of 2650kg = Towball Weight of 240kg.