How to Properly Stack and Load Bread Trays for Safe Transport

Load a dolly in six steps: check the dolly, check each tray, put the heaviest product at the bottom, seat every tray fully on the one below, stop at your height and weight limits, and secure the dolly in the truck so it cannot roll or shift. A stack is only as stable as its weakest joint, so every step is about making each tray lock onto the one beneath it.

What is the loading sequence?

Check the dolly. All four casters roll freely, none is seized or flat-spotted, and the brakes release. The base is level and clean, and it is the base your trays are made to sit on. A dolly that tilts gives the whole stack a tilted foundation.
Check each tray before it goes on. Pull any tray that is cracked, rocks on a flat surface, or fails to lock on a good tray; the tests and the retirement rule are in the three quick checks before a tray goes back on a dolly. A damaged tray low in the stack weakens every tray above it.
Put the heaviest product lowest. Dense loaves and heavy product go on the bottom levels; rolls, buns and fragile items go near the top. Weight low in the stack keeps its center of gravity low, so it is harder to tip when the dolly is pushed, braked or rolled over a threshold. Spread product evenly within each tray.
Seat every tray fully. Use one tray model per stack, turned the right way for the loaded position, with nothing on the rails and no product taller than the tray’s clearance. Check that each tray has dropped into the one below before you add the next. On stack-and-nest trays the orientation decides whether a tray stacks or nests, and a loaded tray set in a nest position drops onto the product below; how stack, nest and cross-stack positions work explains the positions.
Stop at your limits. The stack ends at the lowest of three limits: the stop point for stacking by hand, the dolly’s rated weight, and the height of the truck door or the lowest point overhead. The next section sets out each one.
Cap and secure. An empty tray on top protects the top level of product. In the truck, load dollies tight against each other and against the walls, and use load bars or straps where the load does not fill the space, so no dolly can roll or shift.

How high can a stack go?

No higher than the lowest of three limits. None of them is a single number that holds across bakeries, so work each one out once for every tray model and product you load, and post the result at the dock as a stack card: tray model, product, maximum levels. The loader then reads a number instead of judging one.

The hand-loading stop point. This guide’s screening rule, not a regulatory limit: a stack that people build by hand stops where the top tray would have to be lifted above the shoulder of the shortest person who stacks. Below that point the lifts still need a NIOSH check, because reach, twisting and pace matter as much as height. The rule, the division that gives your tray count and a worked NIOSH example are in calculating the tray count your crew can stack by hand. Taller stacks need a stacker or a lift, not a longer reach.

The weight limit. Loaded stack weight is the number of trays times the weight of one loaded tray. Weigh a loaded tray of your heaviest product, multiply it out and compare it with the rated capacity the dolly maker gives for your model. If the dolly has no written rating, ask for one before you load it to the top.

The overhead limit. The stack plus the dolly has to clear the truck’s door opening and anything that hangs from the roof. Measure the lowest point, not the tallest. The calculation of how many levels fit in your trailer is linked from the logistics overview at the end of this page.

OSHA’s general rule for stored material says that bags, containers and bundles “stored in tiers shall be stacked, blocked, interlocked and limited in height so that they are stable and secure against sliding or collapse” (29 CFR 1910.176(b)). The rule sets no number. Hold stacks that stand waiting on the dock to that standard: a stack that leans, or has an unlocked tray in it, is not stable at any height.

How should dollies be secured in the truck?

So that nothing can move when the truck brakes, turns or hits a bump. For commercial motor vehicles covered by federal cargo securement rules, “Cargo must be firmly immobilized or secured on or within a vehicle by structures of adequate strength, dunnage or dunnage bags, shoring bars, tiedowns or a combination of these” (49 CFR 393.106(b)). Whether your trucks fall under those rules is a question for your fleet manager; the practice is sound either way.

In practice that means:

Dollies packed tight against each other and the walls, so they brace one another.
Load bars or straps across any gap, and across the last row before the door.
Casters locked where the dolly has locks.
Each stop’s dollies kept together, loaded last stop first, so the driver does not move one load to reach another.

How do you keep product from being damaged on the way?

Deal with the three ways it gets damaged in a stack:

Crush. If the product is taller than the tray’s clearance, the tray above rests on it. Measure your tallest product in its packaging against the clearance for the position you use, as in step 4.
Shifting. An unlocked tray lets the level above slide on every turn. Mixed models, worn rails and debris on the rails are the causes to check; steps 2 and 4 cover them.
Moisture. Warm product in a closed stack, or trays moving between cold and warm rooms, can pick up condensation. Let product cool as your process requires before loading, and for frozen and chilled routes see keeping condensation off trays and product.

Move loaded dollies at walking pace, and slow down further at dock plates, floor joints and ramps. Those are the moments a stack takes a sharp jolt.

Which loading mistakes cause stacks to fail?

Mixing tray models in one stack. Trays from different molds may not lock together even when they carry the same size name.
Loading a tray that is cracked, warped or worn at the rails.
Stacking above shoulder height by hand, which puts the top trays down at an angle and off their rails.
Building the stack in the order product comes off the line rather than heaviest first. If the line cannot be resequenced, stage and sort at the dock before loading.
Rushing a loaded dolly across a threshold.

What should you check before a dolly leaves the dock?

Three things, every time: every tray in the stack is locked onto the one below, the stack is under the lowest of your three height and weight limits, and the dolly is braced so it cannot move in the truck. A stack that fails any of the three is rebuilt before it goes, not fixed on the route. How the loaded dolly fits into the rest of the trip, from dock to store and back, is on the tray round-trip overview, dock to store and back.