Trailer Height and Landing Gear

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Build confidence with 10 original questions about Trailer Height and Landing Gear. Review your answers and explanations after finishing.

Supplemental study practice. This is not a government licensing exam or ELDT certification, and does not replace hands-on training. Follow your state’s current handbook.

1 / 10

After connecting the air lines during coupling, how can you check for crossed air lines before moving the vehicle?

Look for air leaks at the glad hands

Check the color of the air lines

Apply and release the trailer brakes and listen for their operation

Drive forward and check for brake response

2 / 10

During coupling, you notice the trailer is too high above the fifth wheel. What should you do before backing under the trailer?

Disconnect the air lines

Lower the trailer so it will be raised slightly by the tractor

Raise the trailer even higher

Back under the trailer as it is

3 / 10

You are preparing to couple a tractor to a semitrailer. What should you check about the parking area before starting the uncoupling process?

Check that the area is wet

Verify the area is unpaved

Ensure the area is sloped downward

Make sure the surface can support the weight of the trailer

4 / 10

After unlocking the fifth wheel during uncoupling, why should you pull the tractor only partially clear of the trailer before stopping?

To make it easier to reconnect the air lines

To keep the tractor frame under the trailer in case the landing gear collapses

To prevent the electrical cable from dragging

To check the trailer brakes

5 / 10

When positioning your tractor to back under a trailer for coupling, why must you avoid backing at an angle?

It may disconnect the air lines

It could cause the kingpin to break

It will make the trailer harder to load

Backing at an angle can damage the landing gear

6 / 10

You are about to uncouple your tractor from a trailer. Why should you chock the trailer wheels if the trailer does not have spring brakes?

To support the weight of the trailer

To keep the landing gear from collapsing

To make it easier to unlock the fifth wheel

To prevent the trailer from moving if air leaks out

7 / 10

After raising the landing gear during coupling, what clearance should you check before driving away?

Ensure there is enough clearance between the rear of the tractor frame and the landing gear

Verify the trailer is loaded evenly

Make sure the trailer wheels are chocked

Check that the kingpin is greased

8 / 10

After disconnecting the air lines and electrical cable during uncoupling, how should you hang the electrical cable?

Hang it with the plug down to prevent moisture from entering

Leave it on the ground

Place it inside the trailer

Wrap it around the landing gear

9 / 10

During coupling, what is the correct way to check that the fifth wheel jaws have locked around the kingpin?

Check the locking lever from outside

Pull forward sharply

Listen for a clicking sound

Go under the trailer and look into the back of the fifth wheel

10 / 10

While raising the landing gear after coupling, when should you switch from low gear to high gear?

After the trailer is fully loaded

Once the landing gear is free of weight

Before starting to raise the landing gear

After securing the crank handle

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About the Trailer Height and Landing Gear practice quiz

This practice quiz focuses on Trailer Height and Landing Gear, listed under CDL Practice — Combination Vehicles. Use it to check what you understand, spot topics to revisit, and connect the material to safe, informed decisions on the road.

Before you begin

Keep your current CDL manual or course notes nearby. Read each prompt carefully and think through why an answer fits, especially when a question describes a vehicle, road, or workplace situation. Licensing rules and procedures can vary, so confirm requirements with current official materials for your state.

After you finish

Review any explanations shown with your results. Note unfamiliar terms or missed concepts, then revisit your manual or course notes before trying again. Use your score to guide study; understanding why an answer is correct matters more than the number alone.

Study note: These quizzes are independent study practice. They are not state licensing exams, official government materials, or ELDT certification, and they do not replace required training.

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