Page 3 - Understanding Weights

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Gross Trailer Mass GTM

GROSS TRAILER MASS (GTM) - the mass
transmitted to the ground by the 'Axle' or 'Axles'
of the trailer when coupled to a tow vehicle and
carrying its maximum load.
The GTM: ATM - TBM

Aggregate Trailer Mass ATM
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AGGREGATE TRAILER MASS (ATM) - the
total mass, including the payload, of the laden
trailer when carrying the maximum load
recommended by the 'Manufacturer'. This will
include any mass imposed onto the drawing vehicle
when the 'Combination Vehicl'ds resting on a
horizontal supporting plane.

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Gross Combination Mass GCM

GROSS COMBINATION MASS (GCM) - value
specified for the vehicle by the 'Manufacturer' as
being the maximum of the sum of the 'Gross
Vehicle Mass'of the drawing vehicle plus the sum
of the 'Gross Trailer MaSs('Axle Loads ') of any
vehicle capable of being drawn as a trailer.
The GCM: GVM + GTM