SX6 clipped with background


SmithCo’s SX6 Six Axle side dump trailer features three standards axels with three Ridewell steerable lift axel suspensions. The SX6's design allows operators with a standard CDL to haul up to 37.4 tons in a single trailer with easier manueverability and less upfront cost than doubles or a train set.

The SX6 side dump trailer works well in most states that have a cap gross weight allowed of up to 129,000 lbs.


  • 40 foot frame length
  • Stockpile or windrow
  • Watertight; no leaks
  • Low load height
  • Dumps toward either side
  • 3 main axles, 3 lift axles
  • AR400 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


40’ tub26.8 cu yd35.6 cu yd

Model SX6 SmithCo Side Dump Trailer

Specs shown are for 49’ frame length; other configurations available.

Frame Length 53'
Tub Length 40’



8’ 7” at Tub side, 9’ 7” at Center

Tub Construction

1/4" Thick, AR400 Steel (or equivalent)

3/16" Thick, AR400 Steel (or equivalent) is optional

External Column Supports, No Center Tub Divider

Frame Construction 80/100 KSI, Fabricated Steel I-Beam
Kingpin 2" Kingpin, 16" Setting, Replaceable Type
Landing Gear Two Speed, Load Bearing

Push Bar Type, Bolt-On

Cylinders 3500 PSI, 6" bore
Hinges Self-Aligning, Spherical Bearing Type (greaseable)

Air Ride Suspension Standard

Spring Ride Available in Limited Configurations


(3) 25,000# capacity

(3) 13.2K Air Ride/Lift/Steerable

Hubs 10 Hole, Hub Piloted
ABS 2S1M Anti-Lock Brake System
Drums Outboard Mount, Cast Steel

Steel Disc, 8.25 X 22.5 (12), 9 X 22.5 on Steerable/lift (6)


11 R 22.5 G Radial Tires on Mains 295/75 R 22.5 on Steerable/lift

Brakes 16 1/2" x 7" std, Disc Brakes available
Fenders Front & Rear, 1/4" Synthetic, 7 Degree Slope
Lights 12 Volt LED, ICC w/ Sealed Harness
Mud Flap (4) 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

3000 PSI

10 Gallon Reservoir

Layout Options

SX6 Rear View
Model SX5 Rear
SX6 5340 L
SX6 53 40