GM to dump Holden

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Gross Vehicle Mass and Gross Combined Mass are the most meaningful measures.  Many vehicles can only legally achieve their towing capacity with absolutely nothing in the vehicle - including the driver 

Towing can be a trap for the unwary in other ways too DJC. For instance, my old Troopy with the 1HZ motor and 5 speed gearbox was not an ideal towing truck due to the design and construction of it's gearbox. If they are to be used for towing then 5th gear(overdrive) should NOT be used, and a gearbox upgrade would be a wise move - or even avoid this model altogether if you want to tow a larger trailer. This gear, i.e. 5th,  is strictly a highway cruising gear in this model. Later versions (turbo) were OK. Anyway, I digress.