Product Description
SO - Step Oil Reservoir - Aluminum - Semi Truck Frame 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
- Integrated Step: Semi Truck Oil Reservoir Frame Step Tank
- Non-slip Steps: Strut Grip Steps
- Smooth Exterior: Smooth Aluminum Finish
- Height & Width Options (in.): 15H & 21H and 24W & 30W
- Depth (in.): 30D
- Mounting Kit Purchase: C-Frame Mounting Kit - M3050C (not included)
Specifications
| Material | Aluminum |
| Dimensions (in.) | 15H & 21H x 30D x 24W & 30W |
| Finish | Smooth Aluminum 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 tank fit my semi-truck? The A-SO52S is offered in widths 24 and 30-inches, depth of 30-inches, and heights 15 and 21-inches to fit a range of common chassis layouts. Measure to confirm the fit or contact American Truckboxes 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-SO52S 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-SO52S mount to the truck? The A-SO52S mounts to the truck frame using ATB mounting brackets and hardware M3050C - Not Included. (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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