6 Axle U Shape Rock Body End Dump Semi Trailer

The 6 Axle U Shape Rock Body End Dump Semi Trailer is HUAYU's overload-capable dump configuration for mining, quarry, and heavy aggregate operators who push past the payload ceilings of 3- and 4-axle tippers. The body is rated at 70 tons (the 70t circle decal on the rear tailgate is the rating mark) against a Baosteel ROCKY 450 wear plate floor and sidewalls, and the chassis spreads that load across six axles — four super-single lift axles on the forward chassis and two dual-tire fixed axles at the rear. Volume is 50 cbm on the standard build, with 55 cbm and 60 cbm body options if the haul is lower-density material.

Why 6 Axles Is the Overload Configuration for Mining

On a 3-axle tipper rated 50-60 tons the load sits on six tire contact patches; on a 4-axle air-suspension tipper the same load spreads across eight. A 6-axle build with the 4-lift + 2-rear-dual layout puts the rated 70-ton payload across 24 tire contact patches, which is the core reason operators in overload markets choose this configuration. The per-axle load at 70 tons comes in at roughly 11.7 tons versus 17.5 tons on a 3-axle rated 50 tons — that margin is what keeps mine-access roads from rutting and keeps individual FUWA axle assemblies inside their rated envelope when the loader operator drops in more than the ticket says.

Six axle running gear with Triangle tires and FUWA hubs

Chassis cross member with brake valves and air lines

The second axle benefit is overload route tolerance. In mine and quarry haul, the operational payload is routinely 20-30% above the legal rated payload. A 3- or 4-axle trailer running at 70-80 actual tons is sitting 20-40% over its axle and tire ratings, which shows up as premature bearing wear and cracked leaf packs. The 6-axle body here carries 70 rated and takes an off-road overload allowance up to 100 tons without the same structural penalty, because the load path is already distributed.

Mixed Suspension: Air Ride on Lift Axles, Balance Beam on the Rear Pair

The running-gear photo shows why this trailer has two different suspension components. The four forward axles ride on air-bag bellows integrated with the lift-axle mechanism. The same pneumatic circuit that lifts the axles clear of the road when the trailer runs empty also carries the axle weight when loaded. The two rear axles, which remain grounded at all times and take the tipping-cycle load transfer, run on mechanical multi-leaf balance-beam suspension sized for the 70-ton rated payload plus the overload margin.

Air suspension bag on lift axle with trailing arm

Mechanical leaf spring and brake chamber on rear axle

The practical effect is that the trailer rides like an air-ride tipper when unladen (the lift axles retract, the running axles stay on leaf packs), and when loaded the air bags re-inflate to share weight across all six axles. Operators who want a straight air-ride build across all six axles can order that, and operators who run in markets where air-bag replacement is hard can order straight mechanical leaf across all six. The default is the hybrid setup because it balances empty-return tire wear against loaded-run durability. For the deeper write-up on air-suspension component life and field maintenance, see the common faults and solutions of trailer air suspension airbag blog post.

Baosteel ROCKY 450 Wear Plate at 70-Ton Rated Payload

Floor is 8 mm Baosteel ROCKY 450 wear plate; sidewalls are 6 mm ROCKY 450. The grade is HB 450 high-hardness wear-resistant steel produced by Baosteel, and it is the Chinese-premium equivalent of SSAB Hardox 450. That is what the body needs to survive repeated impact from sharp rock and ore dropped from an excavator bucket.

Rear tailgate with BAOSTEEL ROCKY 450 and 70t decals

Body underside with structural welds and cross stiffeners

For the full material comparison against Hardox 450 and against generic Q345 dump bodies, see the 3 axle U shape rock body product page. That page holds the canonical ROCKY 450 explainer. The 6-axle build uses the same plate grade and zone thicknesses as the 4 axle U shape rock body; the difference on this model is the chassis and axle count, not the body itself.

Front-Mount Hydraulic Cylinder and 50° Tipping Angle

A HYVA-style 5-stage front-mount telescopic cylinder (FCA-series profile) lifts the loaded body to a 50° tipping angle in roughly 30-40 seconds. Front-mount geometry puts the piston behind the gooseneck rather than under the body floor, which is why the U-shape sidewalls can run unbroken and why the discharge angle stays high enough to empty damp aggregate without bridging.

HYVA front mount telescopic cylinder and electrical connector panel

Front cylinder base mount with warning plate and chassis longitudinal

The 50° angle is worth calling out because most Chinese-export 6-axle tippers in the SERP quote 45°. An extra 5° matters when the load is wet sand, river gravel, or cold-pit ore. Material that tends to stick and bridge at 45° will discharge cleanly at 50°. The front-mount cylinder also means the only under-chassis clutter is the air and brake lines, which is easier to inspect and maintain on the quarry floor than an underbody scissor hoist.

Rest of the Spec Stack

• Kingpin: 90# JOST, 2 inch or 3.5 inch
• Landing gear: JOST 28-ton double-speed
• Brakes: WABCO dual-line ABS, air brake, 24 V electrical
• Tires: 12R22.5 Triangle — duals on the rear 2 axles, super-single on the front 4 lift axles, 24 running tires plus 1 spare
• Lighting: Philips 7N socket, 24 V LED 4-function rear cluster
• Paint: 2-part epoxy primer plus polyurethane topcoat
• Speed labels: 40 km/h laden, 25 km/h unladen, 30 km/h turning

Who Buys a 6-Axle U-Shape Rock Body

• Open-pit and hard-rock mine operators in Central Asia, Africa, and Latin America moving iron ore, copper concentrate, phosphate, or coal between pit and rail siding where the loaded weight routinely breaks past 3- or 4-axle envelopes
• Quarry-to-batching-plant contractors running basalt, granite, limestone, or river aggregate on unpaved haul roads where 24 tire contact patches are the difference between rutting and holding the road
• Infrastructure project subcontractors on dam, highway, and port builds where the loader operator is paid by cycle count and will overfill every bucket unless the trailer can absorb it
• Overload-market fleets in markets where enforcement is lax and the operating payload is 20-30% above the legal rated figure — the 6-axle build is what keeps axle and tire life reasonable under that profile

Frequently Asked Questions

Why does the 6-axle rate 70 tons when the 4-axle rates 60?

Two more axles add 20 more rated tons to the envelope — roughly 10 tons per added axle at the standard 13-ton FUWA axle rating. The 4-axle sibling is rated 60 tons on 4 × 13-ton axles with air suspension, and the 6-axle adds 2 more axles to reach 70 rated / 100 off-road. The increase is in the load path, not in the body steel. Both use the same Baosteel ROCKY 450 plate thicknesses.

What is the difference between the 4 lift axles and the 2 rear dual-tire axles?

The front 4 are single-tire (super-single) lift axles that retract when the trailer runs empty, reducing empty-tire wear on the return trip and reducing rolling resistance. The rear 2 are fixed dual-tire axles that remain grounded at all times and take the full body weight plus the load transfer during the tipping cycle. The rear duals carry the bulk of the empty-body tare and the loaded rear-weight during the 50° tip.

Can I order all 6 axles identical with dual wheels instead of the lift-axle hybrid?

Yes. The standard build is 4 lift + 2 rear dual for tire-wear economy on empty returns, but a straight 6-fixed-axle dual-wheel build is available. It costs more (24 dual tires plus 4 additional axle assemblies), but it is the correct spec for fleets running loaded in both directions or for operators who do not need the lift-axle empty-run benefit.

What haul road types can this trailer run on?

Paved primary haul roads, graded unpaved mine access roads, and quarry yard tracks. The trailer is not designed for soft-ground off-road or for boulder-strewn pit floors where a rigid mine-truck would be the correct choice. The 6-axle layout helps on unsealed haul roads by spreading weight, which reduces rutting and the frequency of grader maintenance on the road itself.

Is the price FOB or CIF?

The listed $29,500 USD is FOB Qingdao, China. CIF to your port adds shipping, insurance, and port charges, usually $2,000-$3,500 depending on destination. Send us the destination port and we will send a CIF quote inside one working day.

What is the lead time?

20-28 working days from order confirmation for standard specification. Longer for custom colors, non-standard axle upgrades, or non-standard body volume. Shipping to Africa and the Middle East takes another 25-45 days depending on shipping route and destination port.

Which component warranties apply to the 6-axle build?

1-year warranty on the main beam, body structure, and welded joints. Component warranties follow the original manufacturer's terms (HYVA, FUWA, WABCO, JOST, Triangle, Baosteel). Full warranty terms are shared during order confirmation.

Ask for a CIF quote with the destination port, preferred suspension type (air, hybrid, or full mechanical) and body volume (50 / 55 / 60 m³), plus any custom specifications. The HUAYU sales team replies within one working day on weekdays. Reach us on the contact page or WhatsApp from any page on the site.