Picture the operations lead at a cold-storage dock, holding two documents: a supplier quote with the lifting capacity printed in bold at the top, and a forklift spec sheet with a front-axle load figure three lines below the model number. The capacity number is already ticked off against the heaviest pallet on the pick list. The axle figure has no box beside it, and nobody on the call can say what the dock lift's axle rating is. That unchecked line is where these purchases go wrong, and the fix is cheap as long as it happens before the purchase order.
A hydraulic dock lift can clear the gross capacity arithmetic and still be the wrong model for the dock. Capacity and axle load rating measure different things. Lifting capacity is the total weight the platform is built to raise. Axle load rating is the share of that load the lift's structure and its axles are rated to carry at a defined point, at the end of the platform or across its side. The Advance Lifts selection guidance treats them as two separate checks that both have to close, and this article works that same case: what the capacity sum actually adds up, why end and side ratings are different approvals, how the equipment on the deck shifts the axle load, and what belongs in the purchase spec when the answer depends on your traffic pattern.
Lifting Capacity Adds Three Weights, Not Wheel Loads
The capacity calculation is simple, which is exactly why it gets over-trusted. Once the platform size is fixed, lifting capacity is the sum of three weights: the heaviest goods being transferred, the weight of the transport equipment carrying them, and the weight of an operator. Add the three and you have the figure to compare with the capacity ratings on the quote. The Advance Lifts sequence runs in that order, platform size first and the three-weight sum second, because the deck dimensions decide where the equipment and the operator can physically stand while the load is on the platform.
What that sum never describes is distribution. A total weight sitting on a deck is carried by the deck surface, the frame, and eventually the axles and wheels underneath. A load spread along the length of the platform and the same load concentrated over a short wheelbase at one end are not the same case for that hardware. Wheel load, or axle load as the selection guides call it, is the portion of the total that lands on each axle of whatever is standing on the deck: the pallet jack, the stacker, the forklift. Those axle figures are published separately from the capacity number, and a quote that leads with capacity makes them easy to skip.
If the quote in front of you lists only lifting capacity, treat it as a first screen and nothing more, and ask for the published end and side ratings before the model goes to approval. The trade-off is a delay while those figures come back and one more round of email, against signing a unit whose axle ratings have never been set beside your own truck's numbers. One of those outcomes is recoverable.
End Load and Side Load Ratings Are Different Gates
The pattern most manufacturers follow is an end-load axle rating sized to match the maximum lifting capacity. That is the friendly case: a truck drives on over the end of the platform, in the direction the lift was laid out for, and the published numbers line up. The same guidance still flags two conditions where that match stops being enough, namely unusual equipment and any application that requires traveling over the side of the lift in anything other than the fully lowered position. Under those conditions the side axle rating can come out marginal even when the end rating looks comfortable.
Both terms are worth pinning down, because they get used interchangeably in conversation and they are not interchangeable on a spec sheet. End load is load entering over the end edge of the platform, in line with the direction the lift is rated to take traffic. Side load is load crossing the platform's side edge, from a truck turning on, a route that cuts across the deck instead of running down it, or a pit layout that forces the approach. They are rated separately because they load the structure in different directions, and a lift that handles a load end-on is not automatically rated for that same load across its side.
Side travel catches operations by surprise because it is a routing decision, not an equipment purchase, and it usually gets made by whoever lays out the aisle. If every trip on and off the platform is end-on at the fully lowered position, the end rating is the check that matters and the side rating can stay in the file. If any route needs a truck to cross the side of the platform while it sits above the lowered position, make the side rating its own go/no-go line in the spec rather than a footnote. The trade-off is a layout or routing change against accepting a side rating that the guidance itself describes as possibly marginal.
Both readings land on the same instruction: compare the axle loads your equipment actually produces against the ratings published for the lifts being quoted. That comparison is what turns two documents into one decision.
Manual Jacks, Powered Jacks, and Fork Trucks Differ
The equipment on the deck decides where the weight goes, and the spread between equipment types is wider than most buyers expect. Manual pallet jacks divide payload weight evenly between their two axles, so the load splits down the middle and the arithmetic stays short. Powered pallet jacks and straddle stackers behave differently: in the Advance Lifts example they often concentrate 60% of the combined payload and equipment weight on the rear axle, and they move heavier loads than manual equipment to begin with. Both factors push the same direction.
Fork trucks go further. The same example puts 80% of the maximum payload plus the fork truck's own weight on the front axle as the usual case, with some unusual trucks running as high as 90%. The truck's own weight belongs in that calculation, not just the pallet, which is the part buyers most often leave out when they compare a capacity figure with a load chart.
Those percentages are attached to a named manufacturer's selection example, not to an industry standard and not to another brand's lift. Their value is comparative: they show how far apart two equipment choices can sit while the payload never changes. A dock that swaps manual jacks for powered jacks, or brings a forklift onto the platform for the first time, changes the axle load the lift sees without changing a single pallet weight. A lift that was correctly sized last year can be marginal this year, and nothing in the goods data explains why the numbers moved.
If your operation runs manual pallet jacks only and loads end-on, the even split is your baseline, and the capacity sum plus the published end rating will usually close the question. If powered pallet jacks or straddle stackers are assigned to that dock, plan around the 60% rear-axle concentration and check the lift's rating against that figure rather than against the total. If forklifts come onto the platform, start at 80% of payload plus truck weight on the front axle and then confirm whether your truck is one of the unusual designs that pushes toward 90%. The trade-off cuts both ways: stepping up in capacity buys more structure and a higher price, and it may not touch the number that is actually failing, while a lift sized to the concentrated wheel load can look oversized on the quote and still be the correct buy. Capacity ratings move in steps; axle concentration does not, which is why raising capacity until the total clears so often buys nothing.
What to Put in the Purchase Spec by Scenario
Three traffic patterns cover most of these decisions, and each one produces a different set of lines in the purchase spec. Start with the equipment assigned to the dock, not with the heaviest pallet anyone can remember seeing.
Manual jacks, end-on approach, deck fully lowered for every trip: the three-weight sum is your first screen, and the published end-load axle rating is the second. Ask for those ratings in writing with the quote so they sit on the same page as the capacity figure. That is the simple case, and I would take a written axle rating over a bigger capacity number on every one of these buys, because the axle rating is the figure that gets compared with your equipment rather than with your pallet.
Powered pallet jacks, straddle stackers, or forklifts anywhere in the rotation: the calculated axle load belongs in the spec before model approval, next to the lift's rated end and side loads. Put the equipment make and model beside that load figure so the supplier can see what produced it. The 60% and 80% concentrations are reasonable starting points for the calculation, and your own truck data overrides them wherever the two disagree.
Any route that crosses the side of the platform above the lowered position: the side axle rating becomes a go/no-go item. If the quoted lift cannot show a side rating that covers the calculated side load, skip that model and go back to the layout drawing, or to a lift with a published side rating that does cover it. On a case like that I would rather move the racking than sign the quote, because the routing change shows up once on a drawing and the alternative shows up every shift that a driver cuts the corner.
Keep the numbers in their own lane. The percentages from the Advance Lifts example describe that manufacturer's equipment classes inside that selection guide; they are not a table for another brand's lift and not a substitute for the axle data published for the model you are buying. When two suppliers publish axle ratings on different bases, per axle against per wheel or end rating against a combined figure, compare only like with like. Ask what a rating covers before it goes into the spec, and if the answer is not clear, that is the question to send back before approval.
Why the Axle Rating Still Decides the Signature
The objection that comes back at the end of nearly every one of these reviews is the one from the opening scene: if the lift's lifting capacity is higher than everything I am putting on it, why does the axle rating matter? Because the capacity number adds three weights and stops. It does not say which axle of your truck carries the load, and it does not change when a driver crosses the deck above the lowered position. Before the purchase order goes out, put two things side by side on one page: the axle load your equipment actually produces, and the rated end and side loads published for the lift. If the spec sheet cannot supply the second, the model is not approved yet, whatever the capacity line says at the top.
