Is GCM the same as towing capacity?

No. Towing capacity is the maximum a trailer can weigh when hitched. GCM is the maximum combined weight of vehicle and trailer. GCM almost always limits real-world towing first.

Sometimes. GCM upgrades are more restricted than GVM upgrades and aren't accepted in every state. Always speak to a qualified engineer and your insurer first.

What if I'm over GCM?

The same consequences as being over GVM: potential defects, fines, insurance issues, and excessive wear on brakes, transmission and tyres.

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What Is GCM? Gross Combination Mass Explained for Towing

GCM stands for Gross Combination Mass — the maximum combined weight of a vehicle plus loaded trailer. Learn how it's different from towing capacity and why it limits real-world setups.