What type of license does Ryan's dad need to drive bigger company vehicles?

In order for Ryan's dad to drive bigger company vehicles, he would require a Class A Commercial Driver License. This type of license is necessary for operating combination vehicles, which include a vehicle with a gross combination weight rating (GCWR) of 26,001 pounds or more, provided that the vehicle being towed is over 10,000 pounds. This license allows drivers to operate a tractor-trailer, which is essential for many commercial driving jobs involving larger loads and long-distance travel.

The Class B Commercial Driver License is suitable for operating a single vehicle with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, but it does not include towing heavier trailers, which is why it would not be adequate for someone needing to drive larger company vehicles that a Class A license covers.

A Standard Class C License is typically for standard passenger cars and doesn't qualify the holder to drive commercial vehicles. Class D Licenses are generally equivalent to standard driver's licenses for everyday vehicles and do not have the necessary endorsements for commercial driving.

Thus, a Class A Commercial Driver License is the appropriate certification needed to safely operate larger company vehicles.