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How to Properly Mount an Under Tray Toolbox on Your UTE

How to Properly Mount an Under Tray Toolbox on Your UTE

Installing an under tray toolbox is one of the most effective ways to increase storage and protect tools while maintaining full tray space on your ute. Proper mounting ensures stability, prevents rattling and extends the lifespan of both the toolbox and vehicle. This guide explains how to install under tray tool box models safely and efficiently.

Understanding Under Tray Toolboxes

An under tray toolbox, also known as an underbody or undertray storage box, mounts beneath the vehicle’s tray, typically behind the rear wheels. This design provides secure, weatherproof storage without taking up tray space, making it ideal for tradespeople and off-road drivers.

Apex Trading Group supplies durable aluminium toolboxes that are corrosion-resistant, lightweight, and purpose-built for Australian conditions.

Why Proper Installation Matters

Learning how to mount under tray tool box units correctly is essential for safety and performance. Poor installation can lead to vibration, structural strain or even toolbox detachment over time. A correctly installed unit:

  • Sits level and flush under the tray
  • Withstands vibration and road impact
  • Maintains weather sealing and alignment
  • Protects tray structure from stress damage

Taking time to install properly ensures reliable use in all working environments.

Step 1: Choose the Right Toolbox

Before beginning, select the right size and shape of the under tray toolbox for your ute.

Key considerations:

  • Dimensions: Ensure clearance between wheels, suspension and mud flaps.
  • Tray Type: Flat trays differ slightly from custom or drop-side trays.
  • Material: Aluminium toolboxes offer strength without excess weight.
  • Door Orientation: Common options include side-opening and drop-down doors.

Step 2: Gather Your Tools and Materials

Before starting installation, prepare all tools and parts.

You’ll need:

  • Socket wrench set
  • Measuring tape
  • Drill and metal bits (if bolting)
  • Mounting brackets or plates
  • Anti-vibration washers or spacers
  • Sealant or rust-resistant coating (optional)

Having everything ready before you start makes the process faster and more accurate.

Step 3: Position the Toolbox

Correct positioning is critical when learning how to mount undertray toolbox models.

  • Hold the toolbox under the tray to check alignment and clearance.
  • Make sure it doesn’t interfere with tail lights, suspension or mudguards.
  • Keep both sides symmetrical for balance and aesthetics.
  • Maintain a slight gap between the toolbox and tray for airflow and vibration reduction.

Mark your mounting points clearly before drilling or bolting.

Step 4: Mounting the Toolbox

There are two main mounting methods: bracket mounting and direct bolting.

Option 1: Bracket Mounting

  • Fix L-shaped brackets to the tray’s underside.
  • Rest the toolbox on the brackets and align holes.
  • Bolt the toolbox securely using washers and lock nuts.
  • Double-check that it’s level and not under strain.

Option 2: Direct Bolting

  • Drill through the tray’s underside using marked points.
  • Insert bolts from the inside of the tray down into the toolbox.
  • Use washers to distribute pressure evenly.
  • Tighten gradually and avoid over-torquing to prevent warping.

For long-term durability, apply anti-seize or thread-lock to prevent bolt loosening from vibration.

Step 5: Check Door Function and Clearance

After securing the box, open and close the door fully to ensure smooth operation.

  • Check that the door clears tyres and suspension.
  • Confirm that locks engage correctly.
  • Inspect for any rubbing or misalignment.

If adjustments are needed, loosen the mounting bolts slightly, realign the box and retighten.

Step 6: Apply Sealant and Final Touches

For extra protection:

  • Apply silicone around bolt holes to prevent moisture entry.
  • Use rust-preventive spray on exposed metal areas.
  • Inspect for sharp edges that could damage seals or wiring.

These small steps help extend the life of your toolbox and prevent corrosion.

Maintenance Tips

Once installed, ongoing maintenance ensures your under tray toolbox remains in top condition.

  • Check bolts and mounts regularly. Road vibration can cause loosening over time.
  • Keep hinges lubricated for smooth operation.
  • Clean seals and latches regularly to maintain dust and water protection.
  • Avoid overloading. Stick to load limits to protect mounting hardware and tray structure.

Common Mistakes to Avoid

Even experienced installers can make small errors that affect performance. Avoid:

  • Mounting too close to suspension or exhaust components.
  • Using undersized bolts or poor-quality hardware.
  • Ignoring uneven alignment (causes door issues later).
  • Over-tightening bolts, leading to stress cracks in aluminium.

Why Choose Apex Trading Group

Apex Trading Group supplies a wide range of aluminium toolboxes and accessories designed for both professional and recreational use. Each under tray toolbox is lightweight and weather and corrosion-resistant. 

  • Precision-built for easy installation
  • Weather-sealed and lockable
  • Suitable for majority ute brands
  • Fast nationwide delivery
  • Designed for Australian conditions

With proven durability and practical design, Apex toolboxes provide the reliability that tradespeople and travellers need every day.

FAQs - Under Tray Toolbox Installation

Can I install an under tray toolbox myself?
Yes, most installations can be completed with standard tools, provided you follow the correct steps and safety precautions.

Do I need to drill holes into my ute tray?
Some models allow clamp or bracket mounting, while others require drilling, depending on tray type and load rating.

What side should I mount my toolbox on?
Many users install one on each side for balanced storage, but placement depends on tray layout and personal preference.

Can under tray toolboxes fit any ute?
Apex toolboxes are designed for universal fitment, but always confirm dimensions and clearance before installation.

Order Online, Visit Our Showroom or Learn More

For high-quality under tray toolboxes and installation accessories, visit Apex Trading Group online. Our team provides expert advice to help you select the right model for your ute and guide you through proper installation.

Email sales@apextrading.com.au or call 0412 677 757 for assistance.

You may also visit our showroom. We are located at 4/48 Riverside Road, Chipping Norton NSW 2170. Our opening hours are Mon-Fri 10am-5pm or Sat 9am-3pm.