Loading a trailer efficiently comes down to three things: using every cubic meter of space, keeping the load stable, and making sure freight comes off in the right order at each stop. Get those right and you cut fuel costs, reduce damage claims, and shave time off every delivery run.
This guide walks through the practical steps dispatchers and freight forwarders use to build tight, safe trailer loads, and shows how planning software like PalletPlan automates the hard parts.
Plan the Load Before You Touch a Pallet
The biggest mistake in trailer loading is starting without a plan. Once pallets are on the floor, rearranging them costs time and risks damage.
Know your trailer dimensions
Standard curtainsider trailers run roughly 13.6 m long, 2.4 m wide, and 2.7 m tall internally. Mega trailers add about 40 cm of height. Jumbo trailers extend length. Know your exact internal dimensions before you start, because even a 10 cm error in height clearance can mean a pallet won't stack.
List every pallet with its dimensions and weight
Before placing anything, collect:
- Length, width, height for each pallet
- Gross weight
- Stackability (can other pallets sit on top?)
- Client or delivery stop assignment
Missing any of these forces guesswork on the dock. A 3D load planner like PalletPlan takes this list and calculates placements automatically, but the data quality going in determines the plan quality coming out.
Set your delivery stop sequence
Multi-stop routes need LIFO (last-in, first-out) loading. The last delivery stop gets loaded first, deepest into the trailer. Stop #1 goes in last, nearest the rear doors, so it's the first freight off the truck.
Getting this wrong means the driver has to dig through the load at every stop, which adds 20-30 minutes per delivery and risks damaging freight that wasn't meant to be moved.
How to Load a Truck Efficiently: Placement Rules
Fill floor space before stacking
Place pallets floor-to-ceiling before advancing to the next section of the trailer. This "column" approach keeps the load stable and makes it easier to verify the plan matches reality. Leaving gaps at floor level and trying to fill them with stacked pallets creates unstable columns and wastes space.
Distribute weight front to back
Heavy pallets go toward the front of the trailer (the cab end), lighter freight toward the rear. This keeps the trailer's center of gravity forward, which improves handling and stays within axle weight limits. A rough rule: the front third of the trailer should carry the heaviest freight.
For detailed guidance on axle limits and weight distribution calculations, see our article on trailer weight distribution and axle limits.
Stack same-client pallets vertically
When pallets from the same client can stack on top of each other, do it. This groups each client's freight into a compact vertical column rather than spreading it across the trailer floor. At a multi-stop delivery, the driver can pull one client's entire order without hunting through the load.
PalletPlan's optimizer rewards same-client vertical stacking automatically. You can also enable a hard constraint that prevents cross-client stacking entirely, which matters when clients require their freight to stay physically separated.
Keep EUR pallet floor areas clean
EUR pallets (800 x 1200 mm) are the standard in European freight. Leaving clean EUR-sized floor areas available makes it easier to add last-minute freight or handle returns. The PalletPlan optimizer scores layouts that preserve these floor areas more highly, so you get this benefit without manual planning.
Client Clustering: Faster Unloading on Multi-Stop Routes
On routes with three or more stops, client clustering makes a real difference. Instead of placing pallets purely by size (which scatters different clients' freight throughout the trailer), clustering groups each client's pallets into a contiguous zone.
The practical result: at each stop, the driver walks to one section of the trailer, pulls everything for that client, and moves on. No hunting, no moving other clients' freight out of the way.
PalletPlan's GRASP-based optimizer handles client clustering automatically when you enable it. The algorithm shuffles client groups as a unit during its search, so each client's freight ends up in a compact zone without you having to place pallets manually. See how it works for the technical details.
Locking Pallets That Are Already Placed
Sometimes part of a load is already on the trailer before you run the optimizer. Maybe a driver picked up freight at a previous stop, or a customer's pallets were pre-loaded at a warehouse.
In these cases, lock the placed pallets before re-optimizing. PalletPlan treats locked pallets as fixed obstacles and optimizes only the remaining freight around them. This prevents the optimizer from suggesting a plan that requires moving freight already on the trailer.
Pallet Loading Best Practices: Quick Checklist
Before signing off on a load plan:
- Delivery stop sequence is set correctly (last stop loaded first)
- Heaviest pallets are toward the front of the trailer
- No pallet exceeds the trailer's height clearance
- Stackable pallets are stacked where possible, with same-client stacks preferred
- Each client's freight is grouped into a contiguous zone
- EUR floor areas are preserved where possible
- Locked pallets (if any) are marked before re-optimizing
Smarter Planning with Software
Manual load planning works for simple, single-stop loads. For multi-stop routes with 20+ pallets across multiple clients, the combinations are too many to optimize by hand.
PalletPlan runs a multi-pass search across hundreds of possible arrangements and returns the best plan based on space utilization, client clustering, stacking efficiency, and EUR floor preservation. The whole process takes under three seconds.
Try it at PalletPlan or check pricing for team plans.
For more on cutting freight costs through smarter planning, see how smarter load planning reduces freight costs.