No
Yes, you will need insurance to drive with a CDL license.
Your CDL permit is in addition to the class of licence you had beforehand. So long as you were licenced to drive a car before you got your CDL permit, you can drive your own car while you possess a CDL permit.
Yes.....
It depends on the model. You need a CDL to drive one that bends in the middle or is over a certain length
If the vehicle requires a CDL in service, it'll require a CDL for the test drive.
Yes you do need a CDL License to drive a bucket truck.
no
No
No you do not get a discount on car insurance if you have a CDL. This license just allows you to legally drive certain vehicles.
No, just to drive it.
If it's a truck which anyone else would be required to have a CDL to drive, then yes.
Probably so. A four car hauler will certainly have a GVW in excess of 10,000 lbs., and the GCWR of the combination is almost certainly going to exceed 26,000 lbs, so you'd need a Class A CDL.