How to choose a VNA lift truck

Is man-up or man-down best for your very narrow aisle warehouse set-up?

Warehouses today face constant pressure to deliver maximum productivity, every single day. With so many types of lift trucks available, from standard counterbalance forklifts to reach trucks, choosing the right equipment can feel like a true dilemma. Gian Schiava explores one of the more specialised solutions: very narrow aisle (VNA) trucks.

(Executive Summary)

As Shakespeare might have said: “Man-up or man-down, that is the question.” In this article, we’ll explain the key differences, so you can decide whether a VNA solution suits your operation and, if so, which one.

You will often encounter very narrow aisle (VNA) trucks where space is limited and/or storage utilisation is critical. VNA is certainly about measurements. But despite what many people think, VNA trucks are not just for squeezing into narrow aisles. Yes, they excel in tight spaces –sometimes even down to 1.2 metres – but they can just as easily operate in larger aisles if the operation requires it.

The real decision between man-up and man-down trucks isn’t dictated by aisle width – it comes down to what you need the truck for: order picking, pallet handling, maximising throughput, precision handling at height?

Before we delve into the detail of this choice, we’d like to address two other factors that deserve mentioning: floor surface quality and driver training. Floor standards and regulations may differ significantly from country to country, but in all cases the floor’s flatness (or even perfection) becomes increasingly critical as lift heights increase. For example, at 15 metres or more, even small deviations in floor level can affect stability, sway and positioning accuracy.

Driver training is another consideration. Do VNA trucks require highly specialised operators? Not necessarily. Some dedicated training is certainly required, but driving a VNA truck is not inherently more difficult than driving a reach truck. It’s simply different.

Man-up VNA lift trucks: operator at height

In a man-up VNA truck, the operator travels vertically with the forks and load. The mast is positioned behind him or her, and the cab is lifted to the right working height. These machines are generally larger and more complex than their man-down counterparts.

Man-up trucks are designed for height and capacity. Typical capacities tend to be around 1.0 tonne. Unusually, Cat® Lift Trucks offers a range that extends to 2.0 tonnes. Maximum lift heights can go up to 19 metres, although such extreme heights might not be what you need. Because the operator is present at height, man-up trucks offer outstanding visibility when placing or retrieving loads

A typical feature of VNA trucks – both man-up and man-down – is the turret head, also known as a swivel head or tri-lateral head. This allows pallets to be handled sideways without turning the truck (hence the ability to operate in such small spaces). We should also note that the masts on these kinds of trucks have special designs.

Man-up trucks are never truly standard machines. Even if several base models exist, each truck is built to an individual specification. A man-up VNA truck is best described as a tailored solution, engineered around the application, aisle width, lift height, load characteristics, guidance system and sometimes even local safety regulations.

Man-down VNA lift trucks: operator at floor level

In contrast, a man-down VNA truck keeps the operator on the ground. Only the mast, forks, and load move vertically. These trucks cannot be used for order picking at height; they are just used for pallet-in, pallet-out operations.

While man-up VNA trucks are tailor-made for each customer’s operation, man-down models are much more standard in their configuration. Cat Lift Trucks offers two models, with capacities of 1.25 or 1.5 tonnes. These can, of course, be customised with optional extra features. Their lift height range, which depends on the mast chosen, has a maximum of 10.35 metres, which is fairly typical in the market.

Because the operator remains at floor level, and because the truck is much shorter, man-down trucks travel faster, offering great throughput. The trade-off is visibility at height. Seeing the load and beams clearly when placing or retrieving pallets at height is more challenging. To compensate, man-down trucks often rely on technological aids such as fork-tip lasers or camera systems. These allow the operator to monitor load positioning indirectly.

Pros and cons in daily warehouse operations

Man-up VNA trucks excel where visibility and flexibility are required. They’re suitable for order picking at height, mixed pallet and picking operations, and handling fragile or irregular loads. Their higher level of vision reduces errors and damage.

The disadvantages are mainly cost and complexity. Man-up trucks require a higher investment and can expose operators to swaying motion at height. Always ask your supplier whether the truck offers modern dampening systems to reduce this effect. Other safety requirements may also be obligatory. In Germany, for example, man-up trucks must be equipped with laser scanning systems to detect people or obstacles in the aisle. Advanced camera systems, sometimes offering 270-degree views, are also common.

Man-down VNA trucks, on the other hand, are about efficiency and throughput. They’re less expensive, easier to maintain, and faster, especially when they’re working outside the aisles. For standardised pallet handling in high-volume environments, they might well deliver some of the lowest costs per square metre. Unlike man-up trucks, they’re not really suitable for order picking at height. When handling loads at higher lift heights, they can benefit from technological aids to accurate positioning.

Side issues: guidance, technology and desired levels of materials handling automation

Guidance systems are essential in VNA environments. Wire guidance uses a copper wire installed beneath the floor surface—usually about 15 mm deep—with sensors mounted on the truck. While this makes the truck itself more expensive, installation costs are relatively low. For hygiene reasons, wire guidance is often preferred to rail guidance in the food industry.

Rail guidance, also known as mechanical guidance, uses steel profiles and rollers. It’s robust but can make aisle cleaning and certain load-handling tasks more difficult. Rail guidance actually makes the truck cheaper compared to wire guidance equivalents. However, this advantage is often offset by the higher installation costs (largely due to high steel prices).

Automation is another factor. Semi-automation, where a warehouse management system (WMS) defines routes and destinations, can simplify work but doesn’t necessarily increase productivity. Experienced drivers are often just as fast. Full automation is technically feasible, but for lower heights AGVs (automated guided vehicles) may be a more practical alternative.

VNA applications and final thoughts

Man-up VNA trucks are typically found in warehouses that require precision, visibility and flexibility. Man-down trucks offer a more efficient and cost-effective solution in operations that don’t require order picking.

Ultimately, the discussion is not about picking one ‘better’ truck over the other. Man-up and man-down VNA trucks serve very different purposes, and the real question is: which truck fits your operation? The challenge is, and always will be: picking the right equipment for your needs.

Watch them in action

Click here to see a video of a Cat® man-up turret truck at work.

Man-up and man-down VNA trucks are not the only machines that operate in very narrow aisles. Click here to see Cat high-level order pickers (HLOP) in a VNA warehouse.

Find out more

Visit the Cat Lift Trucks website for further information on man-up turret trucks and man-down VNA trucks