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View All PlansIf you’re in the market for the Doubles/Triples Trailers endorsement on your ArizonaCDL, you’re likely already aware that the key requirement is passing a 20-question multiple-choice knowledge test. The test requires a score of 80% (or 16 correct answers) to pass. Once you’ve achieved this certification, you receive a “T” endorsement on your CDL, which authorizes you to pull two or three trailers (where such laws allow) and operate combination vehicles that require this added skill and knowledge.
You may be saying to yourself, “That sounds great! But how can I best prepare for this test?”
You will find no shortage of online resources, but too much information can be incredibly overwhelming. What you need is a systematic and focused approach. That’s where our free Arizona CDL Double/Triple Trailers practice test comes in. It is up to date as of November 2025 and includes 20 multiple-choice questions that resemble what you will face at the MVD on your actual test day!
Additionally, as you take our online practice test, you will receive immediate and detailed feedback on your answers. If you get a question wrong, you are immediately shown exactly why a different response is better. This helps solidify the content in your mind as you progress through the practice session, instead of bombarding you with the entire assessment at the end.
The good news is that the state of Arizona only requires the passing of this knowledge test in order to add the “T” endorsement to your already existing Class A or Class B CDL. There are no additional skills or road tests necessary. Once you have prepared, passed our free practice tests, and feel ready to go, you simply apply at the MVD, provide the required documentation, and pay the required fee prior to taking the official test.
Looking for other Arizona-based CDL endorsements? Find tons of valuable information and practice tests here.
Interested in CDL endorsements for another state? We have you covered there as well! Visit this link and click CDL to select your choice of state.
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Last verified for accuracy: November 2025 (reviewed weekly)
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