There are many companies that offer written training and practice tests for passenger-endorsed CDL drivers licenses, including truckercountry.com, freedmvtests.com and cristcdl.com. It is also possible to take practice CDL tests at the Federal Department of Transportation website or a state Department of Transportation website.
There are a variety of DOT requirements to carry a passenger-endorsed CDL, depending on state of residency. Local truck driving or CDL training academies also have access to the appropriate training materials for the region in which the CDL is to be acquired. It is also necessary to pass a driving test and be certified as CDL Passenger-trained by an approved CDL school or employer.