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View All Plans- Updated for May 2025
- Based on 2025 MT commercial driver's license manual
Free MT CDL Double/Triple Trailers Practice Test 2025
Want to drive combination trucks with two or even three trailers? Good news! In addition to Double Pup, Montana allows several other types of Long Combination Vehicles (LCVs) on officially designated routes: Rocky Mountain Double, Turnpike Double, and Triple. (However, you may need an oversize permit if your vehicle exceeds the state’s length or weight limits.) Several key economic sectors in the state make heavy use of double trailers. However, only a minority of truck drivers are qualified to operate them, so demand for qualified drivers is high.
In much of the nation (including Montana), the logistics and freight sector makes heavy use of double trailers for efficient transport. FedEx Freight and UPS use double trailers for freight distribution. Old Dominion Freight Line operates double trailers to provide intermodal and Less-Than-Truckload (LTL) services. Other key economic sectors use doubles, too. The Montana Grain Growers Association depends on Rocky Mountain Doubles to transport wheat and barley from farms to processing facilities and rail depots. Stimson Lumber Company and Weyerhaeuser use Rocky Mountain Doubles to transport logs and processed wood products.
To legally pull doubles or triples, you must hold a Class A CDL and obtain a Double/Triple (T) endorsement on your 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, pre-trip inspections, emergency situations, and state and federal regulations on doubles and triples. (No special skills test is required for this endorsement.)
This knowledge test is based on the official Montana CDL manual (Montana CDL Handbook 2025), especially Chapter 7: Doubles and Triples. We can help you pass the knowledge test on your first try – something you can’t guarantee just by reading the manual.
This is the first of our five Montana Doubles and Triples Endorsement Practice Tests. It’s based on Chapter 7 of the official CDL manual, just like the official Double/Triple knowledge test. It’s up to date as of May 2025. The 20 multiple-choice practice 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 or further elaboration if you get stuck on a question or an immediate explanation of the correct answer if you still miss the question. You can also ask it your own questions about driving.
This practice test isn’t timed; take all the time you want. Disappointed with your final score? You can retake this practice test as often as you wish.
- 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 MT MVD 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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