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Coastwize Towbar Solutions


Aggregate Trailer Mass (ATM) The total mass of the laden trailer when carrying the maximum load recommended by the manufacturer. This includes the towball weight and is measured when the trailer is not coupled to the tow vehicle. The ATM will be specified by the trailer manufacturer and must not be exceeded. You can find this by looking at the id plate on the trailer or by contacting the manufacturer.

A vehicle’s towing capacity is determined by the vehicle manufacturer. The manufacturer will specify:

  • The maximum towing mass for the vehicle
  • The maximum ball weight for the vehicle