SmithCo’s SX5 Five Axle side dump trailer is similar to the four axle model, but features a liftable/steerable axle added behind the landing leg area. The location of this axle helps equalize the weight between the truck axles and the rear trailer axle group.

The SX5 side dump trailer works well in most states that have a cap gross weight allowed of up to 108,500 lbs.


  • 37 to 49 foot frame lengths
  • Stockpile or windrow
  • Watertight; no leaks
  • Low load height
  • Dumps toward either side
  • 1st & 5th steerable axle options
  • 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


34’ tub23 cu yd31 cu yd
36’ tub24 cu yd32 cu yd
38' tub25 cu yd34 cu yd

Model SX5-4938 SmithCo Side Dump Trailer

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

Frame Length 49'
Tub Length 38’



8’ 7” at Tub side, 9’ 10” 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, 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)

Air Ride Suspension Standard

Spring Ride Available in Limited Configurations


(5) 25,000# capacity

(1) 16.6K Air Ride/Lift/Steerable 1st axle, (5th axle optional)

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

Steel Disc, 8.25 X 22.5 (16), 9 X 22.5 on Steerable/lift (2)


11 R 22.5 G Radial Tires (18); Steer Option: 11 R 22.5 H
Radial Tires (16), 295/75 R 22.5 on Steerable/lift (2)

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

SX5 Rear View
Model SX5 Rear
SX5 3734 L
Model SX5 3734 L
SX5 4636
Model SX5 4636
SX5 4938
Model SX5 4938
SX5 5221 DT
Model SX5 5221 DT