SmithCo SX7 7 axle side dumps.
Compare the SX7 when the operation calls for seven trailer axles in a single-trailer configuration. Its 40-foot tub matches the SX6 reference in volume; the extra axle changes the running-gear comparison.
SX7 · 7 axle: current listings
Let’s check the configuration you need.
No matching listings are showing for this family. Send the application, configuration and target date so sales can confirm sourcing options.
Discuss this equipmentWhere this trailer fits.
Compare the running gear, not just the tub
The SX7 reference uses the same 53-foot frame and 40-foot tub dimensions as the SX6 reference, with four steerable lift axles alongside three fixed axles. Compare axle loading, empty weight, tires and maintenance requirements for the actual proposal.
Validate the operating case
Bring routes, tractor specifications, material density and expected cycles. An additional axle does not by itself establish a higher legal payload. Review the complete vehicle and local requirements before committing to the configuration.
Questions before you choose.
Does the SX7 have a larger tub than the SX6?
The published SX6 and SX7 references both use a 40-foot tub with 26.8 cubic yards waterfull and 35.6 cubic yards heaped volume. The reference axle layouts differ. Compare the full combination rather than choosing on axle count alone.
How do I check SX7 availability?
Matching live listings appear on this page, with available and incoming quantities shown separately. If none appear, send your required configuration and target date so sales can review sourcing options.
Bring us the application.
- The material and load
- Bring the material, density, target load and loading equipment. Tub volume and usable payload answer different questions.
- The tractor and route
- Include the tractor wheelbase, axle arrangement and routes. Review the complete combination and required weight distribution before choosing trailer axles.
- The working configuration
- Compare fixed, lift and steerable axles, tires, tarp and tractor hydraulics. Confirm dimensions and equipment on the actual build sheet.
Tell us what you need
Your inquiry goes to Western Truck & Trailer’s sales team.