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.
No.
In some instances, yes.
Only if it's a: transporting hazardous materials or b: a bus designed to transport more than 15 persons (including the driver).
No. Such an endorsement does not exist for US licenses.
Not unless it's a bus designed to transport more than 15 passengers (including the driver).
To answer you we need to know what country's traffic regulations you are asking about.
The carrier bearing is located in the center of a two piece drive shaft. It holds up the center of the drive shaft. The drive shaft extends from the rear of the transmision to the rear drive axle (differental). The two piece drive shaft and the carrier are needed when there is a large angle between the transmission and the differental. The carrier bearing keeps the drive shaft up high under the vehicle.
The carrier bearing is located in the center of a two piece drive shaft. It holds up the center of the drive shaft. The drive shaft extends from the rear of the transmision to the rear drive axle (differental). The two piece drive shaft and the carrier are needed when there is a large angle between the transmission and the differental. The carrier bearing keeps the drive shaft up high under the vehicle.
Air brakes have absolutely ZERO determination in whether or not a vehicle requires a CDL.
If it's transporting a quantity of hazardous materials which requires placards to be displayed, yes. If it's a bus designed to transport more than 15 persons, yes. If it's attached to a trailer which itself has a GVW of more than 10,000 lbs., yes, UNLESS it falls under the farm truck, emergency vehicle, recreational vehicle, or military vehicle exemptions. Otherwise, no.
If the truck and trailer are not equiped with air brakes. If the truck and trailer are not comercial vehicals.
Only if it's designed to carry more than 15 passengers (including the driver), or transporting an amount of hazardous material that it requires the display of placards under FMCSR.