Thirteen Seconds Per Cart, All Day Long
A large hospital laundry operation runs a fleet of trucks between its processing facility and the hospitals it serves. Every day, workers load and unload dozens of heavy rolling carts filled with linens, scrubs, and surgical textiles. The trucks use liftgates, and on paper the liftgate cycle is efficient: roughly twelve to thirteen seconds from ground to truck bed height.
But watch the process for more than one cycle and the inefficiency becomes obvious. Each cart has to be maneuvered into position at the back of the truck, turned sideways to fit the narrow liftgate platform, and carefully balanced on a surface with no rails and no containment. The operator holds the cart steady while the gate rises, then pushes it into the trailer and comes back for the next one. One cart at a time. Every cycle.
If the truck carries twenty carts, that is twenty individual lift cycles, twenty positioning sequences, and twenty trips back to the staging area. The liftgate itself is not slow. Twelve seconds per cycle is reasonable mechanical performance. But the total process takes far longer than it should, because the system can only move one unit at a time. No matter how fast the gate lifts, the one-at-a-time constraint means the total loading time is locked to the number of carts multiplied by the full handling sequence for each one.
This is the bottleneck that most people miss when they evaluate dock-to-truck equipment. They compare lift speeds. They should be comparing loads per cycle.
The Metric Everyone Focuses On (And Why It Misleads)
When facility managers and equipment buyers evaluate dock-to-truck loading solutions, the first specification they compare is speed. How fast does the lift go up? How fast does it come back down? Feet per minute becomes the benchmark, and the assumption is that faster vertical movement equals faster loading.
That assumption holds if the lift is the actual bottleneck. In many operations, it is not. The bottleneck is everything that happens between lift cycles: positioning the next load, maneuvering it onto the platform, stabilizing it, and clearing the platform after the cycle completes. Those handling steps take longer than the lift itself. And they happen for every single load, regardless of how fast the platform moves.
Consider the hospital laundry example. The liftgate cycle is 12–13 seconds. But the total time to position, stabilize, lift, push into the trailer, return the gate, and stage the next cart is closer to 45–60 seconds per unit. The vertical movement accounts for roughly a quarter of the total per-unit time. Doubling the liftgate speed would save perhaps six seconds per cart. Over twenty carts, that is two minutes. It is not nothing, but it is not the kind of improvement that changes the economics of the operation.
The real question is not “How fast does the platform move?” It is “How many loads move per cycle?”
What Actually Constrains Throughput at the Dock
Throughput at the dock is a function of two variables: how many loads move per cycle, and how many cycles are required per truck. Every loading system sets both of those numbers.
A liftgate sets them at one and many. One load per cycle. Many cycles per truck. That is its structural limitation. The liftgate platform is typically 60 to 80 inches wide and 30 to 36 inches deep. It was designed to lower a single pallet or cart from truck height to ground level. It was not designed to be a staging area, a throughput tool, or a batch-loading system. It does one thing at a time because it can only hold one thing at a time.
That means every efficiency improvement within a liftgate system is incremental. Faster hydraulics save seconds per cycle. Better operator training shaves a few seconds off positioning. Smoother cart wheels reduce handling friction. All of these help at the margins, but none of them change the fundamental constraint: the system processes loads in series, one at a time, and the total time to load or unload a truck is the sum of all individual cycles.
To create a step change in throughput, not a marginal improvement, you have to change the number of loads per cycle. That is a platform size problem, not a speed problem.
The Math When Platform Size Changes
A liftgate handles one rolling cart per cycle. Each full cycle (position, stabilize, lift, transfer, return, stage next) takes roughly 45 to 60 seconds. For a truck carrying twenty carts, that is 15 to 20 minutes of loading time per truck, assuming no delays or repositioning issues.
Now change the platform. Instead of a narrow liftgate that holds one cart, use a dock lift with a platform large enough to hold three or four carts at once. The handling sequence changes fundamentally. Workers stage three or four carts on the platform at ground level, the lift raises them all to truck height in a single cycle (approximately 7–8 seconds for a Speed-Lift), and the carts roll directly into the trailer.
The same twenty carts now require five to seven cycles instead of twenty. The vertical lift time per cycle is roughly the same. But the number of cycles drops by 70 to 75 percent. Total loading time for the truck falls from 15–20 minutes to under 5 minutes, because the system is moving three or four units in the time it previously took to move one.
That is not a faster version of the same process. It is a structurally different process. The platform size changed the throughput equation from serial (one load, many cycles) to batched (multiple loads, fewer cycles). No amount of liftgate speed improvement can replicate that shift, because the liftgate physically cannot hold more than one load.
What This Looks Like With a Dock Lift
A surface-mounted dock lift replaces the liftgate entirely. Instead of mounting a lifting mechanism on every truck in the fleet, the facility installs a single platform at the loading area. Trucks back up to it. The platform does the lifting. And because the platform is sized for the operation (not constrained by the dimensions of a truck tailgate), it can handle multiple loads per cycle.
The Speed-Lift® from Superior Handling Equipment provides platform sizes ranging from 5×7 feet up to 8×10 feet, with capacities from 6,000 to 25,000 lbs depending on the model. For a rolling cart operation like the hospital laundry example, a platform that accommodates three or four carts simultaneously converts a twenty-cycle process into a five-cycle process. The lift reaches truck height in approximately 7–8 seconds per cycle. Total truck loading time drops to a fraction of what the liftgate system required.
The operational implications extend beyond speed:
- Fewer cycles per truck. Fewer mechanical operations per truck means less wear on the lift system, less operator fatigue, and faster truck turns.
- One facility asset replaces a fleet expense. A liftgate on every truck adds acquisition cost, reduces payload capacity, and creates a maintenance obligation on every vehicle. A single dock lift at the facility handles all trucks, with or without liftgates.
- Trucks are not modified. Removing liftgate requirements from the fleet specification reduces vehicle cost and increases available payload weight.
- Operator workflow simplifies. Workers stage multiple loads on the platform at ground level, where positioning and arranging is easier and safer. The lift handles the vertical movement in one batch.
For operations where sit-down forklifts handle the loading, the Forklift Pro™ Speed-Lift provides 10,000 to 15,000 lb capacity with controls operable from the forklift seat. For lighter cart and pallet jack operations, the MyDock® Speed-Lift delivers 6,000 to 8,000 lb capacity.
Safety at Higher Throughput
Increasing throughput is only valuable if it does not increase risk. Liftgates present a specific set of safety concerns that become more pronounced at high cycle volumes.
The liftgate platform has no containment. It is a flat plate with no rails, no walls, and no ramp enclosure. The operator holds the load steady during the cycle and manages the transition from platform to truck bed manually. Every cycle is a balance-and-transfer exercise. Over dozens of cycles per shift, the cumulative risk of a dropped load, a shifted cart, or an operator injury adds up.
A dock lift changes the safety profile along with the throughput profile. The Speed-Lift’s Automatic Folding Ramps provide continuous containment around the platform throughout the lift cycle. The 3-sided steel frame and non-skid diamond plate deck create a stable, enclosed loading surface. Operators are not balancing loads on an open plate at truck height. They are staging loads on a secure platform at ground level, where positioning is easier and the consequences of a handling error are lower.
Higher throughput and improved safety are not competing objectives. With the right platform, they are the same objective. Moving more loads per cycle means fewer total cycles, fewer transition points, and fewer moments where an operator is managing a load on an uncontained surface at height.
Where Cycle Volume Matters Most
The platform size advantage is most pronounced in operations that move a high number of individual loads per truck, or that process a high number of trucks per day. The more cycles a facility runs, the more each cycle saved compounds into meaningful time and labor recovery.
Hospital and healthcare laundry operations handle dozens of rolling carts per truck across multiple trucks per day. Every extra cycle is labor time, truck dwell time, and congestion at the loading area. Batch loading three or four carts per cycle converts a truck-loading shift into a truck-loading task.
Grocery and food distribution moves high volumes of palletized freight on tight delivery schedules. Truck turn time directly constrains how many stops a route can make. Cutting loading time per truck by 70 percent creates capacity in the delivery schedule without adding vehicles or drivers.
Commercial laundry and linen services operate on repeating daily routes with consistent cart sizes and volumes. The loading process is the same every day, which makes the throughput multiplier predictable and measurable. A facility that loads eight trucks a day and saves ten minutes per truck recovers over an hour of labor and dock capacity daily.
Distribution centers and fulfillment operations that process mixed rolling stock, carts, pallets, and totes benefit from a platform that accommodates variable load sizes without requiring repositioning for each unit. A larger platform handles the variability that a liftgate forces into a single-file queue.
In each of these environments, the question is the same: is the loading system moving as much as it can per cycle, or is it serializing loads that could move in batches? If it is serializing, platform size is the constraint. And a dock lift is the equipment category that removes it.
The Last Four Feet Is About Flow, Not Just Lifting.
If your loading process moves one load at a time, it is a bottleneck, regardless of how fast it lifts. A Speed-Lift® turns the last four feet of logistics into a batch operation, moving more product per cycle on a platform sized for your actual workload. Schedule a site assessment with Superior Handling Equipment, or call (800) 221-4339 to discuss your operation and your throughput requirements.
FAQs
Why is my loading dock still slow even with a fast liftgate?
Lift speed is only one component of total cycle time. The handling steps between cycles (positioning, stabilizing, transferring, staging the next load) often take longer than the lift itself. More importantly, a liftgate is limited to one load per cycle. Faster speed does not change that structural constraint. Moving more loads per cycle, through a larger platform, is what creates a step change in throughput.
How does platform size improve loading dock efficiency?
A larger platform allows multiple loads (pallets, carts, or totes) to move in a single lift cycle. Instead of twenty individual cycles to load a truck, the same freight can move in five to seven batched cycles. Total loading time drops proportionally because the system is no longer serializing loads that could be moved together.
What is the difference between a dock lift and a liftgate?
A liftgate is mounted on the truck and limited to a narrow platform (typically 30–36 inches deep). A dock lift is installed at the facility and provides a full-size platform (up to 8×10 feet) that handles multiple loads per cycle. The Speed-Lift® replaces the need for liftgates across the entire fleet by providing dock-to-truck capability at the facility itself.
What industries benefit most from platform-based dock loading?
Any operation with high cycle volume benefits: hospital and commercial laundry (rolling carts), grocery and food distribution (palletized freight on tight schedules), fulfillment centers (mixed loads), and any facility where multiple trucks are loaded or unloaded daily. The more cycles per day, the greater the compounding throughput gain from batching loads.
Does a dock lift replace a loading dock?
Yes. A surface-mounted dock lift like the Speed-Lift® provides full dock-to-truck capability without permanent dock construction. It anchors to a flat concrete slab, reaches truck bed height in 7–8 seconds, and handles 6,000 to 25,000 lbs depending on the model. It is a dock alternative, not a supplement to existing infrastructure. Use the Dock Lift Selector Tool to find the right configuration.