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Two main considerations:
1. Gross Combined Weight Rating (GCWR): The maximum weight of a truck, including the truck itself, cargo, passengers, fuel, trailer and trailer cargo.
2. Gross Vehicle Weight Rating (GVWR): The maximum weight of vehicle, including passengers, cargo and tongue weight.
Things that determine these numbers are cooling system, gear ratio / transmission, torque, tires/tire capacity/load range, towing system/hitch/equalizers, braking system, tongue weight and how you load your truck/trailer (load distribution).
The question should be how much can I safely tow where I am going, not what's the most I can tow.
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