Gross combination mass (GCM)

GCM is the limit that catches tow-heavy fleets: a ute can be under its GVM and still be illegal because the ute plus loaded trailer exceeds its GCM.

Exceeding rated mass is a safety issue, an insurance issue and a Chain of Responsibility issue, so fleets that tow should know both numbers for every combination they run.

General information, not tax or legal advice.