Class 3 Commercial Driver Practice · Question
When coupling a small utility trailer to a straight truck, which connection should always be checked first after aligning and lowering the trailer onto the hitch ball?
After the trailer is on the hitch, the safety chains are the first critical connection to make, ensuring that if the coupler fails, the trailer remains attached
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Question: When coupling a small utility trailer to a straight truck, which connection should always be checked first after aligning and lowering the trailer onto the hitch ball?
Answer options:
- The electrical connector for lights ✅ The safety chains
- The brake line connection
- The surge brake mechanism
Correct answer: The safety chains
Explanation: After the trailer is on the hitch, the safety chains are the first critical connection to make, ensuring that if the coupler fails, the trailer remains attached to the towing vehicle, as per safety regulations.
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Question explanations
- When performing a pre-trip inspection, what is the minimum air pressure required in an air brake system before
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- Scenario 2: Gross combination weight (GCW) is:
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