License fees vary from state to state - you'll have to inquire with your state's DMV on this, as I do not know what your state is.
My Class A with two endorsements was $35.
Yes. You'll need a vehicle to road test in for the upgrade.
You can get the more information about CDL classes and their cost from www.middlesexcc.edu/careertrain/control.cfm/ID/3608 website
You need a basic drivers licence before you can upgrade to a CDL. The class of the basic operator's permit varies by state - in some states, it may be Class C, while others will have different classifications for it.
DPA indicates that the licence holder possesses a Class D licence (non-CDL licence classes vary by state, but "D" is normally a standard drivers licence) with a learner's permit to train to upgrade to a Class A CDL.
As much as your state charges... CDL requirements are federally regulated, but prices are not. All you have to do to upgrade to an "A" permit is take the combination vehicles written test and pay the fee.
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.
Varies depending on what class CDL and what endorsements you wish to have, as well. A pricing guide is provided by the State of Tennessee (see related link). Note that the costs listed only cover the actual licencing fees, and do not cover the cost of driving school. Note also that you will first have to get a learner's permit for the appropriate class CDL you're testing for, unless you're transferring an existing CDL from another state. You will have to be a resident of Tennessee for 30 days before they will issue you a CDL, but the 30 day requirement does not apply to permits.
CDL training courses are not that expensive. In the state of NY the cost to take the test is $35.00. Most companies hiring will pay for the fees associated with obtaining a CDL.
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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.