Heavy-duty Low-bed Four-axle Semi-trailer (with Ladder and Hinges)
• Purpose: Transportation of excavators, loaders, mining equipment and heavy structural components
• Overall Length: 12,500–13,000 mm (Gooseneck + Low-bed)
• Width: 3,000 mm (customizable to 3,050 mm)
• Platform Height (Ground Clearance): 900–950 mm
• Gooseneck Height: 1,450–1,500 mm
• Curb Weight: Approximately 12,500–14,000 kg
• Rated Load Capacity: 60–80 tons (African Heavy-duty Reinforced Version)
• Kingpin: 3.5 inches (90mm), JOST or domestic reinforced type, welding/bolting installation optional

## II. Frame and Main Beam (Durable and Heavy-load Resistant)
• Main Beam: High-strength Q345B / 700MC steel, I-beam / Box beam type
• Main Beam Height: 500–520 mm
• Main Beam Thickness: Upper flange 18–20 mm, Lower flange 20–25 mm, Double 12 mm vertical plates
• Cross Beam: Densely reinforced, spacing 400–450 mm, thickness 8–10 mm
• Floor Board: 5–7 mm patterned plate / wear-resistant steel plate, full welding anti-slip design
• Side Frame: No.16–20 channel steel side beam, equipped with lashing rings / rope hooks
• Hinge Structure: Heavy-duty hinges plus high-strength pin shafts between gooseneck and low-bed, foldable and lockable for easy loading, unloading and transit

## III. Axle and Suspension (Specially Designed for Rough African Roads)
• Axle: 4×16-ton heavy-duty axle, FUWA / BPW or domestic reinforced drum brake axle
• Wheel Track: 2,500 mm
• Suspension: Heavy-duty mechanical suspension (multi-leaf leaf spring), 10–12 pieces per axle, equipped with balance arms and reinforced brackets
• Optional: Air suspension (high-end version) with lift axle (reduces wear under no-load condition)

## IV. Wheels and Tires (Puncture-resistant and Wear-resistant)
• Tires: 12.00R20 or 13R22.5 steel radial tires, 18PR reinforced grade, dedicated for African mines and gravel roads
• Steel Rims: 8.5/9.0×20 reinforced steel rims with rust prevention treatment
• Spare Tires: 2 pieces as standard configuration

## V. Braking and Electrical System (Reliable and Easy to Maintain)
• Braking System: Dual-circuit air brake, drum type, WABCO / Kemi valve components
• ABS: Optional installation (Most African low-end configurations are without ABS)
• Parking Brake: Spring energy storage brake acting on the last two axles
• Electrical System: 24V, LED tail lights / marker lights, 7-core international plug, waterproof wiring harness

## VI. Support Legs and Traction System
• Support Legs: 28-ton two-speed manual support legs (JOST D200T or domestic equivalent), single-side load capacity over 40 tons
• Kingpin: 3.5-inch reinforced replaceable type, fitted with wear-resistant bushing

## VII. Loading Ladder (Hydraulic / Mechanical with Hinges)
• Type: Rear-mounted double ladders with hinged folding design, foldable and fixed when not in use
• Drive Mode: Standard hydraulic double cylinder / low-end mechanical spring type
• Dimensions: Length 2,200–2,500 mm, width 600 mm per piece, thickened patterned plate with reinforcing ribs
• Load-bearing Capacity: Over 30 tons per ladder, suitable for 50–80 ton excavator access
• Hinges: Heavy-duty pin shafts plus locking mechanism, foldable and detachable for convenient transportation and storage

## VIII. Gooseneck and Accessories
• Gooseneck: Reinforced structure, capable of placing small equipment, fitted with toolboxes (1 on left and 1 on right)
• Lashing Configuration: Multiple sets of heavy-duty pull rings and stake slots for fixing heavy machinery
• Color Options: Red / Yellow / Orange / Engineering Black, anti-rust primer plus weather-resistant topcoat
• Optional Accessories: Side guards, mudguards, simple rain shelter, wear-resistant floor lining