Up to the maximum legal limit for the type and jurisdiction it is operating.
Assuming you're referring to a 53' semi trailer, 41,000 - 43,000 lbs. for an 80k combination is typical.
The load on the king pin on a semi trailer can be calculated by weighing the vehicle. When weighing the vehicle on a certified scale, the steers (front tires), drives (the two axles on the semi cab) and the tandems (the two axles on the trailer) are all weighed separately as a part of the whole weight. The king pin weight is the weight of the drives.
80,000 lbs
the weight a semi can haul depends on the empty weight of the semi subtract the empty weight from 80thousand pounds. eg ; 80.000 minus empty weight 21.000 equals 59.000 pounds in this instance the cargo that could be legally hauled is 59000 pounds total semi weight which includes all tarps, straps ,equipment and load equal 80.000 pounds
If the axles on that vehicle are all within legal weight limits and the gross weight is legal, yes.
The weight of a load of coal will depend on the amount of coal that you ordered in the load.
It depends what the load is.
About 200 pounds for a semi's chains. The extra weight is more than counteracted by extra traction.
how much weight you can put on it.
14,000 lbs
50005000
69,500 pounds