Any commercial use vehicle or combination with a Gross Vehicle Weight Rating or Gross Combination Weight Rating in excess of 10,000 lbs. requires a DOT medical card for interstate operations. Intrastate operations tends to be a little bit of a grey area, although some state laws clearly require it.
If the Gross Combination Weight Rating (combined GVWRs of both power unit and trailer) exceeds 26,000 lbs., and this is a commercial use vehicle, then it will require a CDL (Class A if the trailer has a GVWR in excess of 10,000 lbs., Class B if the trailer has a GVWR of 10,000 lbs. or less), and thus a medical card will be required.
Air brakes have absolutely ZERO determination in whether or not a vehicle requires a CDL.
The air brakes are irrelevant. And you'd need a medical card in that instance if you were doing interstate operations, but not intrastate operations.
Only if it's a vehicle equipped with air brakes.
Is your question about trailer hitch weight, or actual trailer weight? The trailer hitch point is dependent on which hitch has been installed, and likely not exceeding 150 pounds. Given the breaking system of the vehicle itself, and the fact that it is front-wheel drive, it is not recommended that the trailer be greater than 500 pounds.
No.
Only if it's a: transporting hazardous materials or b: a bus designed to transport more than 15 persons (including the driver).
In the United States you do not have to have a separate license to drive a trailer, unless it is very large or you are doing it for hire.
Only if it's transporting 16 or more persons (including the driver) or sufficient quantities of hazardous material to require placarding with HAZMAT warning signs.
If the Gross Vehicle Weight Rating - not the actual laden weight at the time - is under 26,000 lbs., then no. You will, however, need a current and valid DOT medical card.
You can get your permit to drive the tractor trailer combos as early as 18 years old.
With a category C licence, you can drive vehicles over 3,500kg with a trailer up to 750kg.With C+E, you can drive vehicles over 3,500kg with a trailer over 750kg.With a category C1 licence, you can drive vehicles between 3,500kg and 7,500kg with a trailer up to 750kg.With a category C1+E, you can drive drive vehicles between 3,500kg and 7,500kg with a trailer over 750kg but the combined weight cannot exceed 12,000kg and the trailer cannot weigh more than the vehicle.
No