Urban and regional distribution is the least glamorous job in a fleet and the one where the specification is easiest to get wrong — because the truck that looks right in a showroom is usually judged on the wrong numbers. What actually decides whether an 8.5-tonne delivery truck earns its keep is not the badge on the grille. It is how long the body is behind the cab, how tight it turns at a loading dock, how much fuel it carries for the regional leg, and how much of the declared gross weight is left once the box and the driver are on board. Two Foton Aumark S chassis shortlisted for this duty in Paraguay differ on exactly those points, and on almost nothing else.

This article stays with that one scenario: urban and regional distribution. It does not wander into tippers, tractors or crane chassis. It looks at two listings that are, on paper, the same truck — same engine, same gearbox, same axles, same cab, same gross weight, and prices $132 apart — and works out which 440 millimetres of wheelbase and which 40 litres of fuel tank you are actually choosing between. Everything quoted comes from the two published specification tables, and where one of them is silent, that silence is treated as information.

1. What 8,500 kg GVW actually leaves you to carry

Both listings declare the same gross vehicle weight of 8,500 kg and the same payload class of 7.5T, which is where most buyers stop reading. Do not stop there. Only one of the two publishes a real payload figure: the 3,800 mm wheelbase truck declares a flatbed payload of 5,085 kg. Subtract that from the 8,500 kg gross and you get 3,415 kg for the chassis cab, the body, the driver, the fuel and everything else — and that is the number your bodybuilder will be working against, not the 7.5-tonne badge.

The other useful number is volume. The 3,800 mm truck declares a flatbed cargo box of 5,140 × 2,100 × 550 mm, which is about 5.9 cubic metres. That tells you straight away what class of work this is: palletised groceries, beverage crates, bagged agricultural input, building supplies, parcel cages — dense, stackable, dock-height freight. It is not a bulk-volume truck, and a 550 mm side height says the body is designed to be loaded from a dock or by hand rather than tipped into.

The 3,360 mm listing publishes neither a payload nor a body dimension. That is not necessarily a problem — it is the same homologated platform — but it means you cannot compare the two on carrying capacity from the published data alone. If your route is defined by how many cages fit, get the body drawing in writing before you choose it.

2. Wheelbase 3,800 mm against 3,360 mm: the one difference that matters

The two listings are separated by 440 mm of wheelbase and by almost nothing else. The 3,800 mm truck publishes overall chassis dimensions of 6,920 × 2,135 × 2,320 mm, and 6,955 × 2,270 × 2,370 mm as a flatbed. The 3,360 mm truck publishes no dimensions at all, which is a reasonable hint that it is the shorter, tighter machine and that its body length is the variable the seller expects to discuss.

In practice this is a turning-circle decision. A shorter wheelbase puts more of the truck’s length behind the rear axle line, shortens the distance from the cab to the rear overhang, and lets you get into a narrow dock apron or a market street without a three-point shuffle. A longer wheelbase gives you more frame to mount a 5,140 mm body on, more stability on the regional leg, and a better ride over bad pavement because the axles are further apart. If your daily route is mostly stops inside one city, buy the 3,360 mm. If it is a city run in the morning and an intercity leg in the afternoon, the 3,800 mm is the one that will not punish you on the highway.

One caution: neither listing publishes a turning circle, a kerb weight breakdown, or a body length for the short truck — the three numbers that would settle this definitively. Ask for all three and compare them against the tightest manoeuvre on your actual route.

Light Cargo Truck · 3,800 mm Wheelbase

Foton Aumark S 8.5 T — long wheelbase, 160 L tank

Foton Cummins F3.8s3141, 3.76 L · 105 kW / 141 PS · 450 N·m · ZF 6S558 6-speed manual · rear axle NPR 6.0 T, ratio 4.33, 10,784 N·m · GVW 8,500 kg · flatbed payload 5,085 kg · Euro III

Listed at $16,732 · Urban delivery with a regional leg

View full specification →

Light Cargo Truck · 3,360 mm Wheelbase

Foton Aumark S 8.5 T — short wheelbase, 120 L tank

Foton Cummins F3.8s3141, 3.76 L · 105 kW / 141 PS · 450 N·m · ZF 6S558 6-speed manual · front axle 2.85 T I-beam / rear NPR 6.0 T, ratio 4.33 · GVW 8,500 kg · tyres 7.50R16 tubeless (LL7.50R1614L), inner-tube option · Euro III

Listed at $16,600 · Tight urban routes and short-haul distribution

View full specification →

3. The shared powertrain: 141 PS, 450 N·m, a six-speed and a 4.33 rear axle

Underneath, the two trucks are the same machine. Both run the Foton Cummins F3.8s3141 — 3.76 litres, 105 kW or 141 PS, and 450 N·m of torque. Both send it through a ZF 6S558 six-speed manual, both ride on a riveted frame measuring 70/62 × 70 × 10/12 mm, both carry a 2.85-tonne non-disconnected I-beam front axle and an NPR 6.0-tonne rear axle with a 4.33 ratio rated at 10,784 N·m. Both use a φ362 × φ195 single-plate dry diaphragm spring clutch with pneumatic-hydraulic operation.

Read the axle pair against the gross weight and the picture is coherent: 2.85 tonnes plus 6.0 tonnes is 8.85 tonnes of rated axle capacity against an 8,500 kg gross. The margin is small, and an unevenly loaded pallet run will find it. Check your loading pattern against your local axle-load limits before you commit.

The 4.33 rear axle is the number to interrogate against your route. It is a comparatively tall ratio for an 8.5-tonner, which suits the regional leg: fewer engine revolutions per kilometre, less noise in the cab, and the 3,800 mm truck publishes a maximum speed of 110 km/h. The trade is at the other end of the day. With 450 N·m and six ratios on a tall final drive, a fully loaded stop-start urban route will ask more of the clutch and of first gear than a shorter ratio would. If your work is genuinely dense delivery rather than distribution with a highway section, ask whether a shorter final drive is available on this platform before you sign.

4. Brakes, suspension and tyres: read the small print on both listings

Brake specification is identical across the two and worth reading carefully. Service brakes are front and rear drum air brakes, the parking brake is an air-cut brake, the auxiliary brake is an exhaust brake, and brake control is a load-sensing proportioning valve. Then the two words that matter: ABS optional. ABS is not standard on either truck, and on a delivery vehicle that spends its day in traffic it is worth pricing per unit rather than assuming it is fitted.

Suspension is leaf spring on both axles on both trucks: non-independent longitudinal leaf springs, three leaves at the front. At the rear, the 3,800 mm truck declares 8+6 leaves while the 3,360 mm truck lists the same suspension type without a leaf count. A slightly heavier rear pack on the longer truck is consistent with it being the one intended to carry the bigger body, but confirm the rating rather than inferring it from a spring count.

Tyres are the last genuine difference. The 3,800 mm truck lists 7.50R16 tubeless (Imperial). The 3,360 mm truck lists the same size as standard — 7.50R16 tubeless, specified as LL7.50R1614L — but adds an option: 7.50R16 with an inner tube. If your routes include rough regional roads where a tubeless bead is more likely to be damaged, or where a roadside repairer will plug a tube but cannot reseat a tubeless tyre, that option is worth taking. It is the single most practical item on either specification sheet.

5. Fuel, cab, and the fields the second listing leaves blank

Fuel capacity is the difference felt every day: 160 litres of aluminium alloy on the 3,800 mm truck against 120 litres on the 3,360 mm truck. Forty litres is a quarter of the smaller tank, and it lands on the wrong truck from a route-planning point of view — the short, city-oriented chassis gets the smaller tank. If it will do any regional running at all, ask whether the 160-litre tank can be specified on it.

The cab is the same on both: single row, 2,060 mm wide, three seats, manual flip for service access, power steering through a recirculating-ball box with a φ85 mm gear. Three seats in a single-row light truck is a real advantage for a delivery crew of driver plus two loaders, and the manual flip cab is what makes a roadside engine job possible without a workshop. Neither listing publishes an air-conditioning specification, which is a genuine gap on a truck that will idle in traffic — treat it as unspecified rather than absent, and ask.

Now the honest part. The 3,360 mm listing does not publish overall dimensions, a payload figure, a maximum speed, a rear spring count, a cargo box dimension or a market field. The 3,800 mm listing publishes all of those, and its market field reads Africa (Egypt, Tunisia), Euro III regions — neither listing names Paraguay there. Both are Euro III. If your import permit requires a higher emission standard, confirm this before you order, not after the truck lands.

Axle-load law and the road reality in Paraguay

Paraguay applies axle-load limits in line with regional Mercosur practice — a single-axle limit around 10–10.5 t, a tandem around 18 t and gross combination weight near 45 t — enforced by the Ministry of Public Works. Landlocked Paraguay moves soy and beef out through the river port and the Argentine road network. The practical catch is that the river-port and road mix means a flexible rigid-and-tractor fleet fits better than a single heavy spec. The core business is river-port and agricultural freight, and the terrain is the differentiator: a truck bought for flat-ground numbers loses legal capacity where the grade and the bridge limits bite.

For a distribution rigid the risk is the axle split — load the nose heavy and the steering axle is over before the gross weight approaches the rated figure, which is the most common cause of a fine on an urban trunk route.

What Paraguayan fleets already run

In Paraguay the reference vehicle is a used Japanese truck — Isuzu and Hino dominate the second-hand market — with European brands (Volvo, Scania, Mercedes-Benz) in the premium segment, Sinotruk and Shacman as the established Chinese players, and local assembly in some markets. The used Japanese truck wins on parts density but loses on age and the rebuild cost that lands within a couple of years. The new Chinese truck wins on warranty and a clean bill of health. The mountain grades and long corridors are where a fresh, correctly specced truck beats a tired one, and that is Foton’s pitch.

6. Five checks before you sign

Decide city or regional first, then pick the wheelbase. 3,360 mm for tight dock work, 3,800 mm if the truck ever sees a highway. The $132 price difference is not a reason to choose either one.

Get the missing payload and body figures for the short truck. The 3,800 mm listing declares 5,085 kg of payload and a 5.9 m³ box; the 3,360 mm listing declares neither. Do not assume they are the same.

Price ABS per unit. Both listings say “ABS optional” on a load-sensing proportioning valve with drum brakes. For a truck working in traffic, that is the one option worth insisting on.

Ask about the 160-litre tank and a shorter final drive. The short-wheelbase truck carries 120 litres, and both run a 4.33 rear axle. If your routes are dense and stop-start, ask what alternatives exist on this platform before committing.

Confirm Euro III against your import permit. Both trucks declare Euro III, and neither listing names Paraguay in its market field. Resolve this with your broker before the deposit, not after the vessel sails.

These are simple, serviceable trucks with a coherent specification: a 3.76-litre Cummins, a ZF six-speed, a 6-tonne rear axle and an 8.5-tonne gross weight, published at $16,732 and $16,600. The prices are the figures on the listings and are a starting point for enquiry rather than a landed cost — freight, duties and the body you specify locally all sit on top. Choose the wheelbase from your tightest manoeuvre and your longest leg, then spend the saved money on the options that actually change the working day: ABS, the bigger tank, and a body built to the drawing you signed off.