What is a sliding fifth wheel used for?

a.To make coupling easier

b.To adjust the weight distribution between the tractor and trailer axles to comply with axle weight limits

c.To allow the trailer to slide sideways

d.To increase fuel efficiency

Explanation

A sliding fifth wheel can be moved forward or backward on the tractor frame to adjust how much weight is carried by the tractor drive axles versus the trailer axles. This helps comply with bridge laws and axle weight limits.

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About the CDL Exam

The CDL (Commercial Driver License) exam tests your knowledge of commercial driving rules, safety procedures, and vehicle operation. You must score 80% or higher to pass the written knowledge test. The exam covers general knowledge, air brakes, combination vehicles, and various endorsements.

This question is from the CDL Combination Test #2 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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