No
Not sure what you mean, exactly. Class A is considered the "higher" classification, yes. If you have a Class A CDL, you can operate vehicles requiring that class of licence or any class below that. You could operate a vehicle requiring a Class B CDL, for example, but a driver with a Class B CDL wouldn't be permitted to operate a combination requiring a Class A CDL.
Websites such as www.protruckeronline.com, www.findatruckingjob.com, www.indeed.com, and www.getacdljob.com offer jobs for people who are cdl certified.
All you'd ever need to know about becoming a teacher for CDL certification can be found at www.ctc.ca.gov/credentials/teach.html. In addition, make sure to check out private companies that can help you become certified to teach.
CDL classes are A, B, and C - there is no Class D CDL.
Depends on which Class of CDL. A driver with a Class C CDL is not licensed on that vehicle. A driver with a Class B CDL can drive that combination only if the GVW of the trailer is less than 10,000 lbs. A driver with a Class A CDL can drive it.
Class 3 truck with a rollback body? No, it doesn't require a CDL.
Yes.
You can obtain a CDL class B license at your local DMV. To obtain a CDL class B license you are required to take several tests before obtaining your license.
You will need a Class B CDL with tanker endorsement.
Depends. You can drive up to a Class 6 truck (up to 26,000 lbs. GVWR) without a CDL. Class 7 or Class 8 trucks require a CDL.
Before you can become a class c driver, you must have your cdl license. The cdl license is given to you by the state you live in.
For driving an air brake equipped vehicle, or for working on them? To work on them, you have to get the ASE certification. You must take and complete that ASE test to become certified. To drive a vehicle equipped with them, assuming you're in the US, there is no such license. If you have a CDL, then you must complete and pass the written test and do your road test in an air brake equipped vehicle, or else you get a restriction which prohibits you from operating a commercial vehicle equipped with air brakes.