Directions: This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Each question has two, three or four possible answer choices. Test questions come from the South Carolina Commercial Driver License Manual. Questions come from chapters covering: Driving Safely, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.

Allow rain water to enter the tanks.
Are used to drain water and oil from the air tanks.
Should never be opened.
Must remain open while driving.

Are unsafe.
Are acceptable on tires in the rear of the vehicle.
Are acceptable only when carrying a heavy load.
Are acceptable in combination vehicles.

S-cam drum brake.
C-cam drum brake.
G-cam disc brake.
P-cam disc brake.

Be connected to the glad hands.
Have any slack.
Be secured.
Be leaking.

South Carolina CDL Permit Test - Double

Wait, before you go

Number of questions:	20
Passing score:	16

Directly in front of the trailer.
Directly next to the trailer.
Parallel with the trailer.

It is difficult for the driver to see behind the trailer.
There may be extra weight in the front of the vehicle.
Cargo may fall out of the trailer.

Leaves should shift.
Leaves can be missing.
Leaves should not be broken.