Most of the states that are requiring an 'A' license are requiring it for a GVW of 26,001 pounds or a trailer grossing 10,000 pounds or more. In Texas and other states an 'A' license is NOT a CDL, but allows operator to drive RV's and other non commercial vehicles.
Denny,
That's not correct. The operative word in that phrase is "and" not "or. "
If your actual or rated gross combined weight is in excess of 26,000 lbs. AND you are towing a trailer with actual or rated weight of in excess of 10k lbs. you are required to have one of the two types of class A licenses.
A Class A operator's license is for private non-commercial RV haulers. A Class A CDL (Commercial Driver's License) is required for commercial hauling of the same weights.
Exceeding 26k without the heavy trailer requires a class B license type license. That would apply to RVers driving a motorhome.