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 March 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.