Coupling
- Check the trailer: brakes applied, legs down and level, no damage to the kingpin or front plate.
- Align the unit and reverse slowly. Do not rely on mirrors alone if you are unsure.
- Stop before the kingpin engages and check height and alignment.
- Engage the fifth wheel and listen for the lock.
- Do a tug test with the trailer brakes still on, to prove the coupling holds.
- Check the locking mechanism visually: jaws closed and safety catch in place.
- Connect air lines and the electrical cable, and secure them where they will not chafe or drag.
- Raise the landing legs fully and secure the handle.
- Release the trailer brake, check lights, and do a final walk round.
Uncoupling
- Park on firm, level ground.
- Apply the trailer brake and chock wheels if needed.
- Lower the legs until they take the weight, with the surface able to support it.
- Disconnect and stow air lines and the cable.
- Release the coupling and pull away slowly.
Never
Never go under a trailer while it is not supported. Never rely on one hand check of the lock. Report damaged couplings and parts as defects with a photo.
General information, not legal advice or a substitute for official guidance. Check HSE, DVSA and GOV.UK for current requirements.