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Doubles Triples

USA Fleet Supply offers truck driver training products for drivers who wish to obtain their Doubles Triples Commercial Drivers License CDL endorsement. We also offer Doubles Triples compliance training DVD's, videos, test questions and answers and more. Check out our new Doubles - Triples CDL Training DVD.

Doubles Triples Test Question and Answer Booklet

The original, most popular and the most downloaded Doubles and Triples Test Question and Answer product on the internet. This book contains commercial drivers license doubles & triples test practice questions and answers. This book was designed to help drivers pass the commercial drivers license doubles & triples exam. Each question allows the student to select the correct multiple choice, true false or fill in the blank answer. 


You will need a Doubles/Triples endorsement on any commercial vehicle pulling two or more trailers. Download this Doubles Triples test question and answer study guide and you will have all of the questions and answers in front of you at all times, on your PC or in print.


Double and Triple Trailers are combinations of multiple Trailers on tractor trucks as compared to standard 5 axle semi trailer-trucks with one trailer. Combinations of Double and Triple Trailers include:

  • Turnpike double - two 40 ft trailers or longer up to 53 footers.
  • Rocky Mountain doubles - one 40 ft trailer or longer and another shorter trailer usually a 28 foot (pup)
  • Triple trailer - three 28.5 ft pups
  • B-Train - 33 foot max twin trailer that shares a tridem wheel set between the front and back trailer
  • STAA doubles pups - two 28.5 ft trailers

Doubles and Triples are useful because they can carry extra freight in terms of square and cubic feet capacity as well as weight capacity. Because of extra axles, it spreads out the weight across a longer area. They are also more efficient based on Ton-mileage.

Employers that utilize Double and Triple trailers will encourage you to obtain your Doubles and Triples CDL endorsement. Your chances of obtaining a job with a reputable trucking firm greatly increases if you hold a Commercial Drivers License with the Doubles Triples endorsement. Your local DMV will have material that prepares you to study for the Double Triple CDL exam. However, our test questions and answers download booklet will allow you to attempt your Double and Triple trailer cdl test as many times as you'd like before proceeding to take your exam at your local DMV.

Our test questions and answers are updated annually to make sure you have the latest up-to-date material in order for you to pass your Triples and Doubles exam the first time. We offer numerous CDL training programs that will tech you everything you will need to know in order to obtain your commercial drivers license and all CDL endorsements, including the Doubles / Triples endorsement. Browse our CDL Test Study training product catalog now. if you need help finding the product that is right for you, please do not hesitate to contact a Doubles Triples CDL endorsement representative.

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