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Interested in pulling doubles in your commercial driving career? (Triple trailers are not allowed in Vermont.) Good move! Nationwide, drivers pulling multiple trailers were earning up to $25,000 more per year than drivers of single-trailer vehicles as of early 2025. Demand for such drivers has been high. In Vermont, as in many other states, logistics is one sector making heavy use of multi-trailer vehicles. Multi-trailer vehicles can offer more efficient transport, but only a small percentage of truck drivers have the qualifications and training to drive such vehicles. Let’s see what some of those legal qualifications are.
Chief Educational Researcher, Driving‑Tests.org (ACES member)
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To be legally allowed to pull double trailers in Vermont, you must meet a set of requirements, including passing a series of tests. Because these trucks are a special type of combination vehicle, you must first obtain a Class A Commercial Driver’s License (CDL). To be eligible, you must pass the General Knowledge and Combination knowledge tests. Knowing how to operate air brakes is a practical necessity with heavy multi-trailer vehicles, so you should also pass the Air Brakes knowledge test. Finally, you must pass a skills test in a combination vehicle equipped with air brakes.
To drive double-trailer combination vehicles, you must also obtain a Double/Triple (T) endorsement on your Class A CDL. To get this endorsement, you must pass the Double/Triple knowledge test. This test covers such topics as safe handling, air brakes on doubles and triples, coupling and uncoupling, emergency situations, and state and federal regulations on doubles and triples. (However, no special skills test is required for this endorsement.)
The official Double/Triple knowledge test is based on Chapter 7 (Doubles and Triples) of the official Vermont CDL manual (Vermont CDL Handbook 2025). We offer tools to complement the official manual with intensive training. This Vermont Doubles and Triples Endorsement Practice Test is the first of five such tests we offer. Like the Double/Triple knowledge test, this practice test is based on the official CDL manual. It’s up to date as of December 2025. The 20 multiple-choice questions and answers on this practice test deal with air lines, converter dollies, coupling, emergency situations, following distance, and rearward amplification.
Our AI Assistant can give you a hint if you get stuck on a question or an immediate explanation of the correct answer if you still miss the question. There’s no time limit; take as much time as you want. You can even keep the CDL manual open for reference in another browser tab or separate window. You’ll learn more by looking up the answer to a puzzling question than by random guessing.
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Our trademarked system automatically saves questions you miss, creating personalized tests that target your weak spots until you’ve mastered the material.
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Go beyond the boring black-and-white manual. Our interactive handbook lets you read, listen with an MP3 audio version, or even chat with it to find the information you need, faster.
We build our practice questions from the current 2025 VT Driver Handbook and refine them using patterns recent test‑takers report.
Driver handbook • Knowledge‑test/permit overview • Fees & ID requirements • Office/appointment info
We mirror recurring themes (e.g., right‑of‑way traps, sign look‑alikes) and use similar distractors and wording styles.
We don’t collect or publish actual test items and we’re not affiliated with DMV.
