Exterior Components› Car and Truck Covers

Merritt Aluminum Products Company

UNDERBODY TOOLBOX 18X173/16X60 ALL SMOOTH DOUBLE DOOR SSERIES

$1,336.62

SKU: M0CX 3589

In Stock
In Stock
Ships by Jun 10
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

Merritt underbody boxes are engineered from high-strength, corrosion-resistant aluminum and reinforced with lap-joint corner welds, providing greater structural integrity. They feature automotive-grade perimeter seals, stainless steel T-handle locking latches, and a full stainless piano hinge, designed to keep water, dust, and debris out. Available in multiple sizes, depths, door options, and finishes, these boxes adapt to service bodies, trailers, and flatbeds. The internal track system allows for add-ons like shelves and lanyards.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandMerritt Aluminum Products Company
Part NumberM0CX 3589

Videos

How to install a Merritt side step tool box on your semi truck frame rail

How to install a Merritt side step tool box on your semi truck frame rail
Buyers Underbody toolbox review and Install

Buyers Underbody toolbox review and Install
Mounting Underbody Toolboxes On a Flatbed

Mounting Underbody Toolboxes On a Flatbed

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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