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Free MO CDL Double/Triple Trailers Practice Test 2025
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Based on 2025 MO commercial driver's license manual
- Triple-checked for accuracy
- Updated for March 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 March 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.
6 min to complete
Available in EN and ES
Ensuring the accuracy and quality of our program is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article. 
Verified by Steven Litvintchouk,
Chief Educational Researcher, Member of ACES.
Chief Educational Researcher, Member of ACES.
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What to expect on the actual MO DOR exam
20
questions
16
correct answers to pass
80%
passing score
More MO DOR Written Exam Resources
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