Working inside a trailer or a container puts tighter constraints on a forklift than anything that happens in the warehouse, and it is also where the most serious dock incidents happen.
Get Free Quotes 👑A standard 53-foot dry van gives you roughly 100 to 102 inches of interior width and generally around 108 to 110 inches of interior height, though these vary by trailer. A 40-foot standard shipping container is tighter, at roughly 7 feet 8 inches wide and about 7 feet 10 inches high inside. High cube containers add about a foot of height. Those figures are the hard limits every other decision has to fit inside.
The truck has to physically enter the space, so overall lowered mast height must clear the door opening with margin. Door openings are shorter than interior heights, particularly on containers, and a trailer sitting at a dock may be at a slight angle. If the mast does not clear with room to spare, nothing else about the truck matters.
Once inside, the forks still have to rise to stack. Free lift is how far they go up before the mast starts extending, and inside a container there is nowhere for the mast to extend to. A truck with inadequate free lift can enter the container and then be unable to lift a pallet to the second tier without hitting the roof. Full free lift masts exist for exactly this work and are the usual specification for container loading.
Overall truck width has to leave room to position a pallet, and with roughly 100 inches of trailer width a standard 48-inch pallet leaves very little margin on either side. Trucks used for this work are generally narrow-bodied, and operators need the skill to place pallets square the first time, because there is no room to reposition once a load is partly in.
Cushion tire trucks are the standard choice for dock and trailer work. They are narrower than pneumatic equivalents, lower in overall height, and turn tighter, all of which matter in confined spaces. They require a smooth surface, which a trailer floor and a dock provide. Pneumatic tires belong outside on rough ground and are generally the wrong tool inside a trailer.
Trailer and container floors have load limits, and a forklift concentrates a great deal of weight on a small contact patch. An overloaded or deteriorated trailer floor can fail under a forklift, which is a severe incident. Check the condition of the floor before driving in, watch for soft spots and damaged boards, and confirm the trailer is rated for the equipment going into it rather than assuming.
This is where the fatal incidents happen. The trailer must be secured against movement before a forklift enters it, using wheel chocks or a dock lock, and the brakes set. Trailer creep, where repeated forklift entries gradually push the trailer away from the dock, and early departure, where a driver pulls away while a forklift is still inside, are both well documented causes of serious injury. A communication system with the driver, and a physical restraint rather than a verbal agreement, is what prevents them.
The bridge between dock and trailer carries the full weight of the truck and the load. Use a dock plate or leveler rated for that combined weight, confirm it is properly positioned and secured, and check it for damage before each use. Drive across it squarely and slowly. Approaching at an angle or at speed is how a truck ends up off the edge.
Trailer and container interiors are dark, and operators are frequently driving in reverse in a confined space. A dock light reaching the full depth of the trailer, working lights on the truck, and clear sightlines all reduce the risk materially. Carbon monoxide is also a consideration: running an internal-combustion forklift inside an enclosed trailer or container with inadequate ventilation is hazardous, which is one more reason electric trucks dominate this work.
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One whose overall lowered mast height clears the door opening with margin and which is narrow enough to position a pallet. A 40-foot standard container is roughly 7 feet 8 inches wide and about 7 feet 10 inches high inside.
Because inside a container the mast has nowhere to extend. Free lift is how far the forks rise before the mast grows, so a truck without adequate free lift can enter the container and still be unable to stack a second tier.
Cushion. They are narrower, lower overall, and turn tighter, all of which matter in confined spaces, and a trailer floor and dock provide the smooth surface they need. Pneumatic tires belong outside on rough ground.
Secure it physically before entry with wheel chocks or a dock lock and set the brakes. Trailer creep and early departure are documented causes of serious injury, and a physical restraint plus a communication system with the driver is what prevents them.
Not always. Floors have load limits and a forklift concentrates weight on a small contact patch. Inspect for soft spots and damaged boards before driving in, and confirm the trailer is rated for the equipment rather than assuming.
Only with adequate ventilation. Running an internal-combustion forklift in an enclosed trailer or container builds up carbon monoxide, which is a serious hazard and a major reason electric trucks dominate dock and container work.