A CDL is required to drive any of the following vehicles:
Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds.
Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds.
Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver.
Any vehicle required by federal regulations to be placarded while transporting hazardous materials.
Hi Ellie and welcome to the forum. I am a trainer at Prime but Jim Palmer/Wil Trans train in a similar manner.
All of the companies you mentioned are good but CR England pays tge least and is often seen as a second chance company.
check out these links
Paid CDL Training Programs
Becoming A Truck Driver: The Raw Truth About Truck Driving
what is it you are looking for in a company?
CDL:
Commercial Driver's License (CDL)
A CDL is required to drive any of the following vehicles: