The 26,000 lb. weight limit isn't applicable to what the vehicle weighs at the time, but rather, the weight rating of the vehicle. If you're talking about a Class 7 or Class 8 power unit, the weight rating of the power unit alone will be in excess of 26,000 lbs, before you even factor in the trailer.
As for the farm truck exemption to needing a CDL, it has limitations:
If the truck and trailer are not equiped with air brakes. If the truck and trailer are not comercial vehicals.
No, you cannot.
To obtain a license to drive a flatbed trailer, you will need to pass a CDL test. In preparation for the test, seek out an accredited training program that includes instruction in fundamental knowledge as well as experience in operating vehicles with full loads.
Not in Texas.
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.
Yes, you would. Without the trailer, you could operate it with either a Class A or Class B CDL.
Yes, after the few required months (they can't have other people in the car with them for ___ months after receiving liscence) then a 16 year old can pull a horse trailer anywhere in the U.S. without a special liscence.
no
You must have your license with you to prove you are a licensed driver. Without it, you are not legally allowed to drive.
Yes. You need to be licensed before you can drive, legally. Not only you can get in trouble but your parents as well. Even if they did not know you were driving without a license.
Without another licensed driver, sixteen years of age. With another licensed driver, fourteen or fifteen, depending on weather you have a license or not.
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.