Truck Loading Diagram: What to Show and How to Read One

A truck loading diagram is a drawing that shows where each item goes in a truck or trailer, usually from the top, side and rear, with the loading order and weights. A good diagram lets someone who was not part of the planning load the vehicle correctly without asking.

It is the visual part of a load plan. The cargo list says what is going, and the diagram says where. Below is what a trailer loading diagram must show, how to read one and how to make your own.

What a truck loading diagram must show

• The vehicle. Type, inside length, width, height and which end or side is loaded. Mark the front wall and the doors, so nobody reads it backwards.
• Every item. A box or shape at the right position and approximate scale, with a name or number that links it to the cargo list.
• Loading order. A step number on each item, so the crew knows which goes first.
• Weights. Weight per item or row, the total load and the payload left.
• Stacking. What stands on what, and anything that must not be stacked on.
• Delivery stops. Which items belong to which stop, usually by colour or stop number.
• Unloaded items. Anything that did not fit. It is better to show this than to leave it for the dock to find.
• Handling notes. Securing points, fragile goods and required gaps.

Leave out what nobody needs. A clear drawing with ten labels helps more than a dense one with forty.

The views: top, side and rear

A truck is three-dimensional, and a single view hides something. That is why a truck loading diagram usually has several.

For a simple full truck of the same pallets, a top view may be enough. For mixed goods, stacks or several stops, use all of them.

How to read a trailer loading diagram

1. 1Find the front. Look for the label for the front wall or the doors. Drawings differ on which end is on the left, so do not assume.
2. 2Read the header. Confirm the vehicle, its inside size and the total weight match what is at the dock.
3. 3Check the cargo list. Count the pieces on the drawing against the list, and look for anything marked as not loaded.
4. 4Follow the numbers. Item 1 is first in, normally against the front wall. Follow them towards the doors.
5. 5Check the stacks. In the side view, confirm what stands on what, and whether it can carry the weight.
6. 6Check the balance. Heavy rows should be spread along the floor and balanced left and right.
7. 7Find your stop. On a multi-drop plan, find the colour or number of each drop and confirm that first-stop goods are at the doors.

Example: a simple row diagram

A diagram does not need to be fancy to be clear. Here is a simple top view written as a table, for a 13.6 m trailer loaded from the back with Euro pallets in rows of three. Stop 1 comes off first, so it sits at the doors. All weights are example figures.

From this table you can read a lot. There are 18 pallets, using 7.2 m of floor (6 × 1.2 m), or 7.2 loading metres. The load weighs 10,500 kg. Every row is full from side to side, so left and right balance if the pallets in a row weigh about the same, and the stop order is safe because nothing for a later stop stands between an earlier stop and the doors.

You can also see a problem. All six rows sit against the front wall, so the rear 6.4 m of the floor is empty and much of the weight is at the front. A planner should move the block back or spread the rows, then check the result. Weight distribution in a trailer explains the calculation.

How to make a truck loading diagram

You can draw one on squared paper, in a spreadsheet or in a load planner. The steps are the same.

1. 1Collect the data. Size, weight, quantity and stacking rules per item. See packing list to load plan.
2. 2Fix the vehicle. Use the inside dimensions and the door size of the real vehicle.
3. 3Check capacity. Use the loading metre calculator to see whether the floor is enough before you draw.
4. 4Place the last stop first. Start at the front wall with the goods that come off last.
5. 5Place heavy and large items. Keep them low and spread along the floor, then fit lighter items around them.
6. 6Add stacks. Only where the lower item can carry the weight.
7. 7Check the weight. Compare the total with the payload and estimate the axle loads.
8. 8Number the items. Give each one a step number in loading order.
9. 9Draw the views. Top first, then side, then rear, with the front wall and the doors labelled.
10. 10Hand it over. Print it or send a link, and keep it with the shipment papers. See loading plan for drivers.

Hand-drawn, spreadsheet or software?

Excel vs a 3D load planner compares these in more detail. If you plan often, truck loading software produces the views and the sequence from one plan, so they cannot disagree with each other.

Common mistakes

• No label for the front, so the drawing is read the wrong way round.
• A top view only, which hides a heavy stack or an unsafe pair.
• Item codes that do not match the cargo list or the pallet labels.
• Weights missing, so nobody can check the axles.
• A diagram made for a different trailer from the one at the dock.
• An old version in the driver's hands after a late order change.

The same rules work for other loading spaces. A plan for a container follows the same logic, with door side and weight balance still central, as the sea freight use case shows. For trucks and trailers, see road transport planning.