Surprisingly, most drivers aren't sure whether they need a license to tow. Depending on your tow truck, you might need a commercial driver's license. It'd help to note that there are two types of tow trucks; medium heavy-duty tow trucks for cars or heavy-duty trucks to tow heavier vehicles like other trucks. A CDL license is necessary for heavy duty towing services, but the law varies with medium-duty tow trucks.
You won't need a CDL license for medium-duty tow trucks when transporting one car or less than 26,000 lbs.
overall weight. You'll need at least a class B CDL license if you tow more than 26,000 lbs. Tow trucks with a flatbed can tow up to two cars. Considering most sedans weigh around 10,000 pounds, having two cars means you exceed the maximum weight and must have a class B CDL license.
On the other hand, a class A CDL license is necessary when towing heavy-duty trucks. Mainly, it's because the truck alone weight exceeds the 26,000-pound weight limit. Note that the weight towed significantly affects the hourly rate of most truck drivers and their companies. In some firms, the drivers get paid a percentage of the value they bring, which significantly motivates employees.