Commercial motor vehicle (CMV) means a motor vehicle or combination of motor vehicles used in commerce to transport passengers or property if the motor vehicle—
(1) Has a gross combination weight rating or gross combination weight of 11,794 kilograms or more (26,001 pounds or more), whichever is greater, inclusive of a towed unit(s) with a gross vehicle weight rating or gross vehicle weight of more than 4,536 kilograms (10,000 pounds), whichever is greater; or
(2) Has a gross vehicle weight rating or gross vehicle weight of 11,794 or more kilograms (26,001 pounds or more), whichever is greater; or
(3) Is designed to transport 16 or more passengers, including the driver; or
(4) Is of any size and is used in the transportation of hazardous materials as defined in this section.
So this means if I'm towing my TT with my company truck I do not qualify as a Commercial vehicle there for I do not have to stop at scales. I'll print this off and keep in glove box.