Electric Tuggers: Tow Capacity, Walk-Behind vs Rider, and What They Replace

Most warehouses buy tuggers for the wrong reason and size them against the wrong number. The reason given is usually “we need to move carts”; the number used is usually whatever capacity figure appears largest on the spec sheet. Neither survives contact with a loading dock ramp on a Monday morning.

What follows is how to specify an electric tugger properly: what tow capacity actually means, how rolling resistance and gradient turn a comfortable number into a marginal one, when a rider platform earns its purchase price over a walk-behind, and the throughput arithmetic that decides whether a tugger train genuinely replaces forklift trips or simply adds a machine to the floor.

An electric tugger is a compact battery-powered machine that pulls wheeled carts, dollies, racks or trailers by a hitch rather than lifting them on forks. One operator connects several carts into a train and moves the whole set on a fixed route, so a job that took six separate forklift round trips becomes one scheduled run. Capacities in common industrial use run from about 2,000 lb to 100,000 lb of tow. Tuggers pull loads horizontally, so when the lift is vertical and repeated in one bay, compare jib crane capacities and spans for that station instead. Loads towed in a train shift less when they are wrapped tight, which is where film savings from a wrapping machine start to pay back.

The trips it removes are the ones a forklift should never have been doing. Moving finished goods from a packing line to a staging lane, feeding components to assembly cells, returning empty totes and pallets to the receiving end, shuttling laundry carts or bakery racks between rooms — none of those tasks needs a mast, a counterweight or a raised load, and all of them are made slower and more hazardous by using one.

The safety case is as strong as the throughput case. A forklift moving a raised pallet through an aisle where people are working is the single most common material-handling hazard in a plant. A tugger train travels at walking or slow riding pace with the load at floor level, on wheels, behind the operator’s line of sight rather than in front of it obstructing it. When we compare a tugger to a counterbalance forklift for the same route, the forklift usually wins only where something must be lifted, stacked, or taken off a truck.

The three terms get used interchangeably by sales literature and are not actually the same machine. The distinction matters because it changes what you can do with it and, occasionally, which safety rules apply to the route.

The practical rule is to buy for the dominant task and rent for the exception. A plant that runs four scheduled cart routes a shift and lifts twice a day should own tuggers and keep the lift capacity it already has, not buy a bigger tractor to cover both. Our guide to choosing a tow tractor or burden carrier goes further into where the seated machines earn their extra cost.

This is the section that prevents the expensive mistake. A forklift’s capacity plate tells you the mass it can lift at a stated load centre, and that number is governed by the machine tipping forward. A tugger lifts nothing, so nothing tips. What limits a tugger is traction and motor torque at the drive wheel, expressed as draw-bar pull — the horizontal force it can apply at the hitch, in pounds.

The consequence is that tow capacity figures look enormous next to lift capacity figures, and they are legitimately enormous, because moving a mass horizontally on good wheels takes a small fraction of the force needed to lift it. On a smooth, clean concrete floor with well-maintained polyurethane casters, rolling resistance is commonly in the region of 2% to 5% of the load. Ten thousand pounds of cart therefore needs somewhere near 200 to 500 lb of sustained pull to keep moving.

Three things wreck that assumption, and they are the three things a sales conversation rarely covers.

Read that chart the way a specifier should: the same 10,000 lb train needs roughly 300 lb of pull in the best case and around 1,100 lb in the realistic worst case on the same site. If you buy against 300 lb, you have bought a machine that works on the day of the demonstration and fails in February. Specify against the worst point on the route, add a margin of 25% to 30%, and confirm the duty cycle the battery will actually see.

There is a second reason to be honest about pull, and it has nothing to do with the tugger. The reason people ask for one is usually that somebody is currently pushing those carts by hand. Liberty Mutual’s long-running research programme on manual handling, published as the Liberty Mutual manual materials handling tables, remains the most referenced source of acceptable push and pull forces, and the working thresholds it supports are far below what a loaded cart train demands. Once a cart needs more than one person to start it, the task has already left the range a human should be doing repeatedly. Once the load has reached the cell it still has to be presented at working height, and scissor and tilt lift tables handle that without a second operator.

Once the pull requirement is settled, the second decision is whether the operator walks or rides. This is an economics question, not a preference question, and the variable that settles it is total walking distance per shift.

The arithmetic is easy to run for your own site. A person walks at about 3 mph, or 264 feet per minute. If a route is 800 feet each way and runs twelve times a shift, that is 19,200 feet of travel — about 73 minutes of walking, every shift, per operator. A rider at 6 mph does the same travel in half that, which is roughly 36 minutes returned to the shift. Across two shifts and 250 working days, that is well over 600 hours of labour a year, and it is the whole of the rider’s business case.

Below about 200 feet per round trip, the calculation reverses. Mounting and dismounting costs time, riders need a wider path, and the walk-behind’s turning circle is genuinely better in tight space. For short, frequent, congested cell-feeding routes, the walk-behind is not the budget choice — it is the correct one.

Battery choice follows the same logic. Short walk-behind duties suit lead-acid well enough. Multi-shift riders with no charging window are where lithium’s opportunity charging changes the operating model; the same trade-offs we set out on lithium-ion battery cost and runtime apply directly to tuggers.

The milk run is the reason tuggers exist in manufacturing and food plants. Instead of a forklift responding to individual requests, one tugger runs a fixed circuit on a fixed timetable, dropping full carts and collecting empties at each station. The route is scheduled; the demand is absorbed by the schedule rather than by a driver reacting.

The throughput comparison is straightforward. A counterbalance forklift moves one or two pallets per trip, and the trip includes travel out, positioning, lifting, travel back and putting down. A four-cart tugger train carries four cart loads per circuit and stops only to unhitch and re-hitch. On a route of any length, one tugger operator running a timed circuit replaces the work of six to ten forklift round trips per hour, and does it with a predictable arrival time that the line can plan around.

The secondary effects are usually larger than the direct labour saving. Work-in-progress inventory falls because stations are replenished in small, frequent quantities instead of a pallet at a time. Aisle congestion falls because one scheduled vehicle replaces several reactive ones. And the fleet requirement falls: plants that convert three or four routes to milk runs commonly find they can reduce the counterbalance fleet, which is where the real capital saving sits.

Two conditions have to hold for any of it to work. The load must already be on wheels or be worth putting on wheels — carts, dollies, racks and mother-daughter trolleys are the enabling investment, and they are not free. And the route needs the space for a train to turn without reversing, because reversing a multi-cart train is slow, and doing it repeatedly is how carts get clipped.

This is the question buyers get wrong most often, and the wrong answer is expensive. A tugger is not exempt from forklift-style training requirements because it has no forks. OSHA’s powered industrial truck standard, 29 CFR 1910.178, defines a powered industrial truck to include tractors as well as fork trucks and motorized hand trucks. Tuggers and tow tractors sit squarely inside that definition.

That means the full training obligation applies: formal instruction, practical training, and an evaluation of the operator’s performance in the workplace before they are permitted to operate one unsupervised. Certification is specific to the truck type and the workplace, so a certificate earned on a sit-down counterbalance does not automatically cover a rider tugger on a different route. Re-evaluation is required at least every three years, and sooner after an incident, a near miss, or a change of equipment or conditions.

Practically, the topics that matter most for tuggers are the ones forklift training covers least: train dynamics and off-tracking on corners, how much longer a loaded train takes to stop, hitch engagement checks, maximum cart counts for the route, and pedestrian interaction at blind corners and doorways. Our OSHA forklift operator training guide sets out how the evaluation itself is documented in California, and the same structure applies to a tugger.