- Updated for May 2025
- Based on 2025 NH commercial driver's license manual
Free NH CDL Double/Triple Trailers Practice Test 2025
To be legally allowed to pull multiple trailers, you must meet a set of requirements, including passing several tests. You must obtain a Class A CDL to drive combination vehicles. To do this, you must pass the General Knowledge test and the Combination knowledge test. You should also pass the Air Brakes knowledge test because nearly all multi-trailer truck configurations have air brakes. You must also pass a skills test in a combination vehicle with air brakes.
To drive combination vehicles with double trailers, you must also obtain a Double/Triple (T) endorsement on your Class A CDL. (Triple trailers are prohibited in New Hampshire.) 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. (No special skills test is required for this endorsement.)
All these knowledge tests are based on the official New Hampshire CDL manual (New Hampshire CDL Handbook 2025). The Double/Triple knowledge test is based on Chapter 7: Doubles and Triples.
We offer a set of tools to complement the official manual with intensive training and ensure you pass the Double/Triple knowledge test on your first try. (We guarantee it!) This practice test is the first of our five New Hampshire Doubles and Triples Endorsement Practice Tests. It’s up to date as of May 2025 and based on the official CDL manual, just like the official Double/Triple knowledge test. The 20 multiple-choice practice questions and answers on this practice test address such topics as air lines, converter dollies, coupling, following distance, rearward amplification, and rollovers.
If you get stuck on a question, you can ask our AI Assistant to rephrase the question, give you a hint, or answer any of your questions about commercial driving. If you still miss the question, the AI assistant will immediately give you the correct answer and an explanation.
Demand for drivers qualified to pull doubles has been high. In much of the country (New Hampshire included), the logistics sector makes great use of double-trailer vehicles. In New Hampshire, LTL (Less-Than-Truckload) carriers in particular, such as Old Dominion Freight Line and XPO Logistics, use double trailers to transport LTL shipments between distribution hubs.
The retail and E-commerce sector also uses double trailers for bulk deliveries from distribution centers to stores and supermarkets. Facilities doing this in New Hampshire include the Amazon Delivery Network and Walmart Distribution Centers.
- 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 NH DMV exam
questions
correct answers to pass
passing score
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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