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If your unloading an aircraft, you need to be as close as possible.
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power loading onto the trailer
Ensure the trailer is backed firmly against the dockEnsure the driver has pulled both the tractor and trailer air brakesEnsure the trailer wheels are chockedEnsure that platform from the dock to the trailer is firmly in placeEnsure that the trailer is secured to the dock via the mechanism which comes up and clamps onto the trailer's DOT bumperEnsure the light outside the dock is displaying RED (and not GREEN)
pull trailer away from the boat ramp
Laptops should always be placed in carry-on baggage. This is because laptops are expensive and can be damaged during the loading and unloading process of the checked baggage. If you are a frequent air traveller, you might have noticed that they really "throw" your baggages when loading onto/unloading from the aircraft.
Power loading onto the trailer.
At a minimum, ensure the driver has the spring brakes set and the wheels are chocked. Some shippers may require that the emergency line to the trailer (red line) be disconnected. Some may also require that drivers remain in a drivers' lounge during loading.
power loading onto the trailer
check for water or wiring problems, brown clothing, lint basket free of lint,
Come to a complete stop until the bus is loaded and is no longer displaying flashing lights.