- Updated for January 2025
- Based on 2025 SC commercial driver's license manual
Free SC CDL Double/Triple Trailers Practice Test 2025
Thinking about the Doubles/Triples Trailers endorsement for your South Carolina Commercial Driver’s License (CDL)? It’s a smart move that will immediately increase your marketability and earning potential in the industry. From the rolling hills of the Blue Ridge Mountains, to the flatland of its eastern coast, you’ll see a good mix of terrain and opportunities with this addition. The main requirement is passing a 20-question multiple-choice knowledge test with a score of 80% (16 correct answers). That’s it! Since this is an addition to your CDL, you’ve already done the really hard part (the skills test). Once you pass this knowledge test, you’ll receive the “T” endorsement on your CDL, granting you the ability to legally tow two or three trailers in authorized areas (South Carolina CDL Handbook 2025).
In the Palmetto State, you must be at least 18 years of age to add this certification to your CDL; however, federal law mandates the age requirement to travel across state lines is 21 or older. This endorsement qualifies you for pulling doubles and triples, but only double trailers are allowed in South Carolina. Fortunately, double trailers are often used throughout South Carolina for the transport of automotive parts and vehicles (Spartanburg is home to a major BMW plant), agricultural products like soybeans, peaches, poultry, and tobacco, textiles and manufacturing goods, forestry products, and consumer goods and electronics (especially near its major coastal ports). I can hear you now: “Let’s do this! But where do I start?”
Designed to simplify the task of studying for the knowledge test, our online South Carolina CDL Double/Triple Trailers Endorsement practice test offers a fine-tuned approach specific to the test material and format you’ll face at the DMV without all the excess information you will find online. Up to date as of January 2025, it includes 20 multiple-choice questions that offer instant feedback, which is a much more effective way to learn than facing all of the feedback at one time at the end.
You only need to pass the official knowledge test. When you feel fully prepared from practicing with our free tests, simply head over to the DMV and apply. Take your documents, pay the fee, pass with flying colors, and take a huge step in advancing your career to the next level.
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual SC DMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- When you're pulling more than one trailer, which trailer should be the first one behind the tractor?
- Which of these statements about quick steering movements and doubles/triples is true?
- You are driving a 100-foot double trailer combination at 50 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
- Before connecting a converter dolly to a second or third trailer, you should check the height of the trailer. The trailer height is right if
- You are driving a 100-foot double trailer combination at 30 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
- With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When you do this, you should hear
- Empty trucks
- Which of these statements about handling doubles and triples is true?
- Before you can supply air to the air tanks of a second trailer, you need to
- You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking, you should
- How can you be sure that you supplied air to a second trailer?
- What is likely to happen if the pintle hook is unlocked while the dolly is still under the second trailer?
- You want to hook your combination to a second trailer that does not have spring brakes. To do this without wheel chocks, you should
- Which of these statements about managing space to the sides is true?
- The crack-the-whip effect that troubles trucks with trailers is most likely to tip over
- You are visually checking the coupling of a converter dolly to the rear trailer. How much space should there be between the upper and lower fifth wheel?
- You are pulling doubles. A set of trailer wheels goes into a skid. Which of the following is most likely to occur?
- You are doing a walk-around inspection of a double or triple trailer rig. You should be sure that the converter dolly air tank drain valves are ______ and the pintle hook is _______.
- A converter dolly is
- A converter dolly consists of a ______ wheel and ________ axles.
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