Practice question

If the tractor must be uncoupled from the trailer for service while on a slope, what must be done first?

Chock the trailer wheels, set the trailer parking brake, and confirm aerial is fully bedded and stowed
Set tractor parking brake only
Leave trailer with intercom on
Disconnect electrical first, then mechanical

Answer: A — Chock the trailer wheels, set the trailer parking brake, and confirm aerial is fully bedded and stowed

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