CDL · Doubles and triples
Your set of twins includes a loaded rear trailer that you are about to unhook. How low should its landing gear go?
Correct answer: Enough to relieve the dolly of part of the trailer's weight.
Answer options
- AUntil the trailer is lifted completely clear of the dolly.
- BEnough to relieve the dolly of part of the trailer's weight. Correct
- CNot at all; leave it raised until the dolly has been pulled out.
Why
Lowering the gear far enough to take some of the load off the dolly keeps the trailer supported while making the dolly easier to release and roll out. The gear should never stay up, and there is no need to jack the trailer entirely off the dolly.
About this question
Topic: Doubles and triples License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
Practice the whole set
This question is part of Coupling Doubles and Converter Dollies (28 questions). Take the full set and check your score.
Practice Coupling Doubles and Converter DolliesMore questions from Coupling Doubles and Converter Dollies
- The second trailer you need to couple has no spring brakes, and you have no wheel chocks. What should you do before you couple it?
- You have backed the converter dolly under the rear trailer of a double and are about to check the coupling. How should that trailer's landing gear be positioned?
- Once the converter dolly is hooked to the rear trailer, you check the connection by eye. How much of a gap should there be where the upper fifth wheel meets the lower one?
- What are the basic components of a converter dolly?
- How can you release the brakes on a converter dolly?
- You release the pintle hook before the converter dolly has been pulled out from under the second trailer. What is the likely result?
- On a set of doubles, where should the rear trailer's landing gear be while you test the coupling?
- What is unique about the way triple trailers are coupled?
Practice on your phone.
Practice here in your browser, or use the app with the same questions and explanations. It's free on the App Store.