Low-Platform Step-Deck Flatbed Semi-Trailer
The Low-Platform Step-Deck Flatbed Semi-Trailer (also recognized as a lowboy step-deck or drop-deck heavy haul trailer) is an ultra-versatile, high-capacity commercial transport semi-trailer engineered specifically for over-height construction machinery, tall industrial equipment, transformers, and heavy break-bulk cargo. Built with high-strength Q345B/Q550 structural steel and automated submerged-arc welding, its distinct dropped lower deck configuration significantly reduces overall loading height and center of gravity. This structural design enables legal highway transit under strict overhead clearance limits while providing superior lateral stability during heavy haulage. Equipped with rear mechanical or hydraulic loading ramps, 13T–16T low-bed axles, and heavy-duty multi-leaf suspension, it offers exceptional load distribution and drive-on convenience for contractors and heavy transport fleets. Fully certified under ECE, ISO9001, CCC, CE, DOT, and SGS standards.
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Product Details
Technical Specifications
Model NO. : Customized
Type : Semi-Trailer
Load Capacity : 50T/60T/80T
Condition : New
Grade : Heavy Duty / Heavy Haul
Shape : Drop-Deck / Low-Platform Step Deck
Origin : Shandong, China
Production Capacity : Customized
Certifications : ECE, ISO9001, CCC, CE, DOT, SGS
HS Code : 8716399000
Overall Dimensions : 13500-15000 x 3000 x 1250-1450 mm (Lower Deck Height: 850-1000mm)
Platform Dimension : Upper Deck + Lower Deck (Customized Deck Length)
Wheel Base : 7800 + 1310 + 1310 mm
Tread : 2050 mm
Axle Number : 3 / 4 Axles
Axle Brand : FUWA / BPW / HuaJin Heavy Low-Bed
Axle Capacity : 13T / 16T
Tire Number : 12 / 16
Tire Specification : 235/75R17.5 / 245/70R19.5 / 10.00R20
Tire Brand : Triangle / Double Coin / Linglong / Chaoyang
Rim : 6.75-17.5 / 7.50-19.5 / 7.5-20
Suspension : Heavy Duty Mechanical Leaf Spring / Air Suspension
Leaf Spring : 10pcs / 12pcs (90x16mm / 100x16mm)
Brake System : ABS Anti-lock Braking System
ABS Brand : WABCO / Kemi / Haldex
Self-dumping : Not Self-dumping
Material : High-Strength Steel (Q345B/Q550)
Main Beam Height : 500mm / 520mm
Upper Plate : 16mm / 20mm
Down Plate : 18mm / 20mm
Middle Plate : 10mm / 12mm
Welding : Automatic Submerged-Arc Welding
Platform Floor : Thickened Checkered Steel Plate 4mm / 5mm
Loading Ramps : Dual Spring-Assisted or Hydraulic Heavy-Duty Loading Ramps
Landing Gear : 28T Two Speed Heavy Duty / JOST / FUWA
King Pin : 50#(2") / 90#(3.5") Interchangeable Reinforced
King Pin Brand : JOST / FUWA
Twist Lock : Optional 8pcs Integrated Container Locks
Spare Tire Carrier : 2pcs
Tool Box : 1pcs Reinforced Lockable Steel Box
Electric System : 24V, 7 Pin Socket, LED Light
Wiring Harness : 6 Lines
Painting : Sand Blasting + Primer + Two Coats Heavy-Duty Topcoat
Colour : Optional
Warranty : Main Beam 3Y / Axle 1Y
Package : Nude / Container / Ro-Ro
Delivery Time : 25-30 Working Days
Payment Terms : T/T, L/C
Key Structural & Performance Features
1. Drop-Deck Low-Profile Architecture & High-Tensile Spine
- Low Center-of-Gravity Drop Frame: Designed with a stepped transition from the gooseneck to the main lower deck, effectively dropping deck height to 850–1000mm to maximize vertical load headroom and prevent tipping during tight cornering.
- Q345B/Q550 Reinforced Structural Spine: Deep main longitudinal beams fabricated using high-yield steel and continuous Submerged-Arc Welding (SAW), providing high resistance against deflection under concentrated point loads.
- Machinery Loading Ramps: Fitted with heavy-duty rear spring-assisted or hydraulic loading ramps, allowing excavators, bulldozers, and heavy wheeled loaders to ascend directly onto the deck.
2. Axle, Suspension & Pneumatic Braking Systems
- Heavy-Duty Low-Bed Axle Configuration: 3 or 4 heavy-duty commercial low-bed axles (FUWA / BPW / HuaJin; 13T/16T capacity per axle) equipped with small-diameter tires to maintain an ultra-low platform profile.
- Robust Heavy-Haul Suspension: Reinforced multi-leaf spring suspension (10pcs/12pcs, 90x16mm or 100x16mm) or air suspension designed to handle continuous high-tonnage shuttling over mixed road surfaces.
- Advanced Pneumatic Braking System: Dual-line ABS air braking system (WABCO / Kemi / Haldex brands) ensuring fast, responsive stopping performance across fully loaded transit routes.
3. Operational Accessories & Safety Setup
- Heavy-Duty Landing Gear & Kingpin: 28-Ton two-speed heavy-duty landing gear (JOST / FUWA) combined with interchangeable 50#(2") or 90#(3.5") kingpins for secure tractor coupling.
- Perimeter Tie-Down Points: Heavy-duty outriggers and forged D-ring lashing points arranged along both side beams for flexible, multi-angle securing of heavy machinery.
- Corrosion Protection: Surface fully cleaned via automated shot-blasting, coated with anti-rust primer, and finished with double polyurethane topcoats for maximum weather durability.
Commercial & Logistics Terms
- Warranty Policy: 3-Year warranty for the main structural chassis frame; 1-Year warranty for axles.
- Delivery Lead Time: 25 – 30 working days upon order confirmation.
- Packaging & Shipping: Nude packing; shipped via Ro-Ro vessel, Bulk Cargo ship, or Flat-Rack container.
- Payment Terms: T/T (Telegraphic Transfer), L/C (Letter of Credit).
