How do I know a part fits my truck?

Every listing shows the truck make, model years, side (left/right) and OEM cross-reference numbers. Match any of your OEM numbers to the listing, or send us your number and we will confirm fitment.

Do you ship the same day?

Orders placed before 12PM Central on business days ship the same day from our US warehouse. Transit is typically 2–5 business days depending on your state.

What is your return policy?

30-day returns on unused parts in original packaging. Wrong part shipped by us? We cover the return label and ship the correct one first.

Do you offer fleet or shop pricing?

Yes. Business accounts get tiered pricing, saved reorders and a dedicated line. Open a business account to see your pricing and order online.

Are these OEM or aftermarket parts?

We sell quality aftermarket parts cross-referenced to OEM numbers, plus select OEM-grade lines. Brand and grade are shown on every listing.

Can I order by part number?

Yes — type any part number or OEM cross reference into the search bar. If it is not listed, send it to us and we will source it.

Toolbox Mounting Brackets Steel, for 18x18in Boxes

Underbody Tool Cabinet Mounting Brackets – 18" x 18" Aluminum Set – L & R Pair

Toolbox Mounting Brackets Steel, for 18x18in Boxes

Support your storage with Underbody Tool Cabinet Mounting Brackets. Heavy-duty 18x18 steel L & R set for trailers. Thick-wall C-channel design. Ships from IL.

Brand
- FleetPro
Truck Make
- Universal
Quality Tier
- Aftermarket
Condition
- New
Warranty
- 1-Year FleetPro Warranty

Wholesale pricing for approved accounts

Open a FleetPro business account to see fleet pricing and order online. Repair shops, trucking companies & dealers welcome.

Request a business account

Terms and Conditions
30-day returns on unused parts
Same-day shipping on orders before 12PM CT

Internal Reference: 10.1818.KIT

Same-day shipping before 12PM CT from our Illinois warehouse
Part requests and quotes answered within one business hour
30-day returns
1-Year FleetPro Warranty
Wholesale and fleet pricing for approved business accounts
We speak English, Russian, Ukrainian, Romanian, Bulgarian, French and Polish

Secure your storage solution with these Underbody Tool Cabinet Mounting Brackets. Specifically engineered to support heavy-duty underbody storage, these brackets provide the structural foundation needed to keep your gear safe over thousands of miles. This set includes both the driver side and passenger side brackets, allowing for a balanced, professional-grade installation of your 18" deep by 18" high toolboxes on any flatbed, step-deck, or vocational trailer.

High-Strength Steel: The Underbody Tool Cabinet Mounting Brackets Advantage

These Underbody Tool Cabinet Mounting Brackets are manufactured from heavy-duty steel for the load-bearing strength and rigidity a fully loaded cabinet demands. Designed for a precise fit with standard 18" D x 18" H underbody cabinets, these brackets ensure your storage unit stays perfectly level and secure on both sides of the chassis.

As we continue to build the largest inventory of commercial truck parts in Illinois, we prioritize mounting hardware that withstands extreme road vibration. Featuring a heavy-duty C-channel design, these 18" x 18" brackets maximize surface contact with the trailer frame, distributing the weight of the loaded cabinet evenly. Whether you are hauling heavy chains or straps, these brackets provide the rigid support necessary to prevent cabinet "sag" or weld fatigue.

Product Details

Brand	FleetPro
Truck Make	Universal
Quality Tier	Aftermarket
Condition	New
Warranty	1-Year FleetPro Warranty

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