SmithCo’s SX2 Tandem Axle side dump trailer is one of our most popular and versatile models. The SX2-4034 is the most commonly produced size for tandem axle units, and with a 204″ wheelbase tractor it can achieve 80,000 legal gross in all states under the Federal Bridge Formula.

Shorter tandem axles trailers are produced to handle maneuvering issues, or combined with converter dollies for doubles operations. Common models for these shorter tandem axle trailers are the SX2-3024 and SX2-3327.


  • 30’ to 42’ 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

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

Model SX2-4034 SmithCo Side Dump Trailer

Specs shown are for 39’ 5” frame length; other configurations available.

Frame Length 39’ 5”
Tub Length 34’
Width 8’ 6”
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

Push Bar Type, Bolt-On

Cylinders 3500 PSI, 5" bore
Hinges Self-Aligning, Spherical Bearing Type (greaseable)
Suspension Air Ride; Four Spring & others optional
Axles (2) 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 (8)
Tires 11R 22.5 G Radial Tires (8)
Brakes 16 1/2" x 7"
Fenders Front & Rear, 1/4" Synthetic, 7 Degree Slope
Lights 12 Volt 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

Min. Tractor Hydraulic Reqs.

25-30 GPM

2,600-2,800 PSI

10 Gallon Reservoir

Layout Options

SX2 Rear View
SX2 4034
Model SX2 4034
SX2 4236
Model SX2 4236
SX2 4034 L Lead Trailer
Model SX2 4034 L Lead Trailer
SX2 3024 P Pup Trailer
Model SX2 3024 P Pup Trailer


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