Coupling, Uncoupling, Towing and Trailer Handling
Coupling sequence
Follow a fixed order. Check the fifth wheel and kingpin are compatible and undamaged, reverse squarely and slowly, and listen and feel for the lock engaging. Then perform a visual check and a pull test, connect the air lines and electrical lead, wind the landing legs up, release the park brake, and check lights and brake operation. Only then move off.
Uncoupling sequence
Park on firm, level ground, apply the park brake, chock wheels if needed, lower the landing legs, disconnect the lines and lead, release the coupling, and pull away slowly while watching for movement. Never leave a trailer standing on its landing legs on soft ground without support.
Towing and handling
A combination handles differently: it cuts in on turns, swings out at the rear, and needs more space. Reverse with mirrors, using small steering inputs, and use a guide where possible. Watch for trailer swing and for low bridges and overhead obstructions.
Traps
Questions often reward the pull test and the visual check. Skipping either is the classic wrong answer. Another trap is forgetting to check the trailer brake and lights after coupling.
Rule of thumb
If you did not see and feel the coupling lock, and did not pull-test it, it is not coupled.
Worked example
After reversing under a trailer you hear the lock engage. Correct: get out, check the jaws are closed around the kingpin, and pull-test gently against the trailer brake before connecting lines. Driving off immediately is wrong.