CDL Permit Prep – Doubles & Triples



The ProDriverU Doubles and Triples CDL permit test preparation tools are designed to help you study for the Doubles and Triples written test you will take if you want to get a CDL to drive double or triple trailers.

The Doubles and Triples CDL permit knowledge test is for commercial drivers if you want to pull double or triple trailers.  This is an Endorsement to the CDL.

The ProDriverU tools in this course contain information you need to learn to pass the CDL knowledge test for driving safely with double and triple trailers. It tells about how important it is to be very careful when driving with more than one trailer, how to couple and uncouple correctly, and about inspecting doubles and triples carefully.

If you want to drive a commercial vehicle that pulls double or triple trailers, you must take a test on this information to get a CDL with Doubles/Triples Endorsement. These written tests are usually administered at your local DMV office.

The following topics are included in Combination Vehicles:

  • Pulling Double/Triple Trailers
  • Coupling and Uncoupling
  • Inspecting Doubles and Triples
  • Checking Air Brakes


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