- Updated for January 2025
- Based on 2025 MO commercial driver's license manual
Free MO CDL Double/Triple Trailers Practice Test 2025
Looking to boost your Missouri Commercial Driver’s License (CDL) with the Double/Triple Trailers endorsement? To add the Double/Triple Trailers endorsement to your Missouri CDL, the main hurdle is passing a 20-question multiple-choice knowledge test. You’ll need a score of 80% (16 correct answers) to get this endorsement. After passing, you’ll receive the “T” endorsement on your CDL, which is your ticket to pull two or three trailers (in permitted areas) and drive combination vehicles that require this added expertise (Missouri CDL Handbook 2025).
The Show-Me State, located in the center of the United States, Missouri acts as a central trucking hub for interstate transport. Though triple trailers are not allowed (even with this endorsement) on the roads in Missouri, rest assured that earning this endorsement and the ability to tow doubles not only increases your standing in the transport industry but dramatically raises your job prospects and earning potential. Double trailers are often used in Missouri for the transport of agricultural, automotive, chemical fertilizers, building materials, and, of course, consumer goods and FedEx and UPS package shipments. You may be saying to yourself, “This sounds incredible! But how can I best prepare for the test?”
The internet is packed with information, some great, some not so great. With so much to dig through, it’s easy to feel completely overwhelmed. What you need is a systematic, targeted approach, and that’s exactly what our Missouri CDL Double/Triple Trailers practice test offers. Up to date as of January 2025, it includes 20 multiple-choice questions that resemble what you will face at the DOR on your test day!
As you work through our online practice test, you’ll receive detailed feedback after each answer. If you miss a question, you’ll see right away why the correct answer is better. This process reinforces your understanding and strengthens your memory as you progress rather than saving all the feedback for the end.
To add the “T” endorsement to your Class A CDL in Missouri, all that’s required is passing the knowledge test. Once you feel ready, after having practiced with our free tests, you simply apply at the DOR. Bring your documents, pay the fee, and pass the test to officially add the endorsement.
Looking for other Missouri-based CDL endorsements? Find tons of valuable information and practice tests here.
- 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 MO DOR 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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