On a trailer nameplate, "ATM" stands for "Aggregate Trailer Mass." It refers to the total weight that a trailer is designed to carry, including its own weight and the weight of any cargo, equipment, or accessories loaded onto it. The ATM indicates the maximum allowable weight for the trailer when it is fully loaded.
"GTM" stands for "Gross Trailer Mass." It represents the actual weight of the fully loaded trailer, including its own weight and the weight of any payload, but excluding the weight of any connected towing vehicle. The GTM indicates the current weight of the trailer, taking into account the load it is carrying at a specific time.
In summary, ATM refers to the maximum weight capacity of the trailer, while GTM refers to the current weight of the loaded trailer, excluding the towing vehicle.
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