Smithco sx3 triple axle side dump trailer


SmithCo’s SX3 Three Axle side dump is a popular choice in states allowing extended gross weights for truck/trailer combinations with more than five axles. The SX3-4234 and SX3-4636 are the most common three axle trailer sizes but lengths run from SX3-3734 to SX3-5036.

Shorter to mid-length trailers tend to be used for everyday construction jobs, while the longer three axle trailers are frequently used for line-haul applications.


  • 37 to 50 foot frame lengths
  • Stockpile or windrow
  • Watertight; no leaks
  • Low load height
  • Dumps toward either side
  • AR450 Steel Tub, One Piece Floor
  • 80/100 KSI Steel Frames
  • Self-Aligning, Spherical Bearing Hinges
  • External Column Tub Supports
  • No Center Tub Divider
  • Shot Blast Paint Prep
  • Polyurethane Paint


SX Series Tub Capacities

34’ tub23 cu yd31 cu yd
36’ tub24 cu yd32 cu yd

Model SX3-4234 SmithCo Side Dump Trailer

Specs shown are for 41’ 5” frame length; other configurations available.

Frame Length 41’ 5”
Tub Length 34’
Width 102’
Height 8’ 3” at Tub side, 9’ 6” at Center
Tub Construction

1/4" Thick, AR450 Steel (or equivalent)

3/16" Thick, AR450 Steel (or equivalent) is Optional

External Column Supports, No Center Tub Divider

Frame Construction 80/100 KSI, Fabricated Steel I-Beam
Kingpin 2” Kingpin, 18” Setting, Replaceable Type
Landing Gear Two Speed, Non-Load Bearing
Bumper Push Bar Type, Bolt-On
Cylinders 3500 PSI, 5” bore
Hinges Self-Aligning, Spherical Bearing Type (greaseable)
Suspension Air Ride Suspension Standard Spring Ride Available
Axles (3) 25,000# capacity
Hubs 10 Hole, Hub Piloted
ABS 2S1M Anti-Lock Brake System
Drums Outboard Mount, Cast Steel
Wheels Steel Disc, 8.25 x 22.5 (12)
Tires 11 R 22.5 G Radial Tires (12)
Brakes 16 1/2” x 7”
Fenders Front & Rear, 1/4” Synthetic, 7 Degree Slope
Lights 12 Volt LED ICC w/Sealed Harness
Mud Flap (2) Polyline Anti-Spray Splash Guard w/ SmithCo name

Polyurethane, any combination of gray, white or black

Special colors available upon request

Minimum Tractor Hydraulic Requirements

25-30 GPM

2,600 - 2,800 PSI

10 Gallon Reservoir

Layout Options

SX3 Rear View
SX3 4234
Model SX3 4234
SX3 4436
Model SX3 4436
SX3 4736


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