It depends somewhat on what state you are in. In much of the country the maximum non overload permit tag limit is 80,000 pounds. In some areas this is reduced, by road limits and bridge capasitys.
A commmercial vehicle is a truck or bus that is bigger in weight than a car. (ex. school bus, 18 wheel truck)
An 18 wheel (or 5 axle) truck in the United States at maximum legal weight (in most states) weighs 80,000 pounds or 40 tons.
in the 1900,s
On what road?
The curb weight of a 1971 Chevrolet truck is 3,600 pounds for short wheel base models. Curb weight is the weight of the truck in a ready to drive state.
18 tons
To calculate the psi (pounds per square inch) exerted by an 80,000 lb 18-wheel semi-trailer on the ground, you need to consider the number of wheels and the total weight. If the trailer has 18 wheels, the weight per wheel is 80,000 lbs divided by 18, which is approximately 4,444 lbs per wheel. The psi can be calculated by dividing the weight per wheel by the contact area of the tire; for example, if a typical semi-truck tire has a contact patch of about 100 square inches, the psi would be approximately 44.44 psi.
Weight distribution, and compliance with the bridge law formula for weight limits.
18 wheeler has the higher gross weight
I would have to guess that the average weight of the entire wheel (tire and rim) for a car is around 20 lbs. For a truck, maybe 25-30.
The weight limit for a truck crossing the bridge is 18 metric tonnes.
It depends on the weight of the truck, combined with the weight of the passengers and any additional cargo.