Title: Combination Vehicles
Product review: This book combines Combination Vehicles with Doubles and Triples. They are seperate test. The book does not go into the Trailer Hand Valve (trolley valve, johnson bar); Tractor Protection Valve; Trailer Air Supply Control, which are all required reading for the Combination Vehicle test. Beware if you are taking the CDL in the state of Texas the book does not cover Special Requirements for Texas Commercial Motor Vehicles. That is 16 pages of missing information that you need to know.
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