Product Description
SO - Step Oil Reservoir - Aluminum - Semi Truck Step Tank
This SO Step Toolbox is an aluminum truck toolbox designed for semi-truck oil reservoir and step applications, built for contractors, fleet operators and technicians who need secure access and fluid monitoring. This step tank comes with a sight glass and filler cap for on‑vehicle oil service and containment.
Made in the USA, and manufactured by American Truckboxes, LLC in Blanchard, North Dakota , with over 25 years of experience. For custom sizing, fleet pricing or additional questions, please call 888.996.0376, or visit us at truckbox.com.
Key Features
- Material: Aluminum
- Oil Monitoring: Sight Glass
- Service Access: Filler Cap
- Oil Control: Single baffle to Manage Fluid Movement
- Non-Slip Steps: Strut Grip Steps
- Smooth Exterior: Smooth Finish
- Width Options: 12W, 18W, 20W, 24W
- Depth and Height Options: 26H and 28D
Specifications
| Material | Aluminum |
| Dimensions | 26H, 28D, 12W, 18W, 20W and 24W |
| Finish | Smooth Finish |
| Warranty | 60-month limited |
Frequently Asked Questions
Where is this toolbox made? Made in the USA in Blanchard, North Dakota by American Truckboxes LLC, with over 25 years of manufacturing experience.
What warranty comes with this toolbox? 60-month (5-year) limited warranty for standard boxes. Applies to the original purchaser only and is non-transferable. For full details, visit us at truckbox.com, or call 888.996.0376.
Can I order a custom size? Yes, custom sizes are available. Please call 888.996.0376.
Will this step oil reservoir fit my semi-truck? The A-SO51S is offered in widths 12", 18", 20", and 24" with a 26" height and 28" depth, designed for semi-truck installations. Measure to confirm the fit or contact American Truckbox if a custom size is needed. Call us at 888.996.0376.
How do you access the oil and check levels on this reservoir? The A-SO51S includes a filler cap and a sight glass for level inspection and filling access. The strut grip steps provide walk-on access to the cap while maintaining a smooth exterior finish.
Is the aluminum finish corrosion resistant? This model is constructed of aluminum and has a smooth finish without paint. Aluminum construction provides corrosion resistance for longer term durability, compared to a steel finish.
How does the A-SO51S mount to the truck? The A-SO51S mounts to the truck frame using ATB mounting brackets and hardware. Consult American Truckboxes for mounting kit recommendations. (Refer to the truck O.E.M. manual for recommended mounting and drilling instructions)
Need help choosing?
Tell us the truck. We will match the box, or build one.
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