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0451 437 007
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Melbourne's Custom Trailer Manufacturer, Built Around Your Job

Flatbed, box, plant, tradie, camper or something one-off — Mountain Chassis builds it in Campbellfield, to the load and the job, not a standard size on a production line.

Australian steel. AS/NZS welds. A trailer that does exactly what you need it to, for tradies, businesses and private buyers across Melbourne and Victoria.

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A Trailer That Fits the Work You Actually Do

If you’re hauling gear, stock, plant or a camper setup, a standard trailer rarely fits the job exactly. Mountain Chassis is a Campbellfield-based trailer manufacturer building flatbed, box, plant, tradie, camper and purpose-built trailers for tradies, businesses, caravan manufacturers and private buyers across Melbourne and Victoria.

Every build starts the same way: we find out what you’re carrying, how often, and in what conditions. From there we spec the trailer to that job.

Welder MIG welding tube steel during custom chassis fabrication, close-up of torch and sparks.
Welder MIG welding a steel chassis frame on a fabrication jig in the workshop.

Who We Build For

  • Tradies and small businesses — day-to-day equipment and materials, built into a trailer that matches how you actually work, not the tradesman special in a catalogue
  • Plant and equipment operators — rated and configured for the specific machinery you're moving, not a generic weight rating
  • Caravan manufacturers — trailer units and chassis for production runs, with compliance paperwork included from the start
  • Private buyers — camper or one-off builds, explained plainly, with zero pressure to commit before you're ready

Not Sure Which Configuration You Need?

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Trailer Types We Specialise In

Flat Bed Trailers

Open deck, no roof, no walls. Built for machinery, equipment or oversized loads that won’t fit inside a box trailer.
  • Single, tandem or tri-axle, depending on the load
  • Custom deck length, width and height
  • Galvanised or painted finish

Box Trailers

Fully enclosed and weatherproof. Keeps tools, stock or goods dry and out of sight in transit.
  • Internal dimensions built to what's actually going in it, not a standard size
  • Lockable, weatherproof construction
  • Drop-side, cage or standard box configurations available

Plant Trailers

Rated and built for the specific plant equipment it’s carrying, not a generic load rating. Heavy-duty deck construction for excavators, skid steers and bobcats
  • Loading ramp systems engineered for the equipment being carried
  • Reinforced tie-down points and load anchors
  • ATM rated to suit your tow vehicle and how you'll actually use it

Tradie Trailers

Set up around a working day — the gear, the materials, the way you actually load and unload it.
  • Custom toolbox and storage layouts
  • Generator, compressor and equipment mounting points
  • Cage trailer options for bulk loads and green waste
  • Lockable, security-focused builds where the job calls for it

Camper Trailers

A purpose-built base for a camping or touring setup, configured to what you’re fitting on it

Off-road suspension and articulating couplings where the application calls for it

  • High-clearance chassis design for unsealed roads and tracks
  • Galvanised or Raptor-coated for harsh conditions
  • Custom layout to suit your fit-out, not a fixed floor plan

Purpose-Built / Custom Trailers

Doesn’t fit the categories above? If you can think it, we can build it. Tell us the application and we’ll engineer it.
  • Tiny home and mobile business chassis, engineered for the actual structure going on top
  • Food van and commercial-kitchen-weight chassis
  • Fifth-wheeler chassis with the right kingpin geometry
  • Fold-up A-frame and pop-top configurations
  • One-off builds for genuinely unusual requirements
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Finish Options

How a trailer is finished affects how long it lasts in the conditions it’s actually used in. We offer a full range of finishes, matched to your application:
  • Hot-dip galvanised — strong corrosion protection, suited to off-road and coastal use
  • Powder coat — a durable colour finish for on-road and semi off-road builds
  • Painted — primer and top-coat finish, with a range of colour options
Close-up of MIG welding sparks and smoke during steel chassis fabrication.
Assembled off-road caravan chassis with dual axle and off-road tyres, built by Mountain Chassis, Melbourne.

Precision and Compliance You Can Verify

Every caravan chassis we build is fabricated with the relevant Australian Design Rules in mind, most importantly ADR 62, which governs the strength and design of the mechanical connection between a tow vehicle and a trailer, including drawbars, couplings and safety chains. Where a build needs its own engineering certification — custom configurations, oversized loads, or modified components — we work with qualified engineers to get that documentation sorted for compliance and registration before your chassis leaves the workshop.

  • ADR 62 compliant — with a traceable certificate provided upfront, so there's nothing to chase later
  • AS/NZS standard welding — every structural weld carried out to standard, not just to "looks right"
  • Precision-verified — flatness, squareness and straightness checked before a chassis leaves the workshop
  • 3-year warranty — every chassis frame we build is covered for 3 years
  • Australian-sourced steel — right material, right grade, for the load and the conditions

How It Works

How a Custom Trailer Build Comes Together

Enquire

Call, email, send us a WhatsApp message or complete our online form. Tell us what the trailer needs to carry, and how often it’ll be used

01

02

Consultation & Quote

We’ll review your brief, then we can talk through your build and provide a clear, itemised quote before any work begins

Design Review

You see and approve the spec — dimensions, coupling, finish — before a single cut is made.

03

04

Fabrication

Cut, jigged and welded at Campbellfield, checked for flatness, squareness and straightness as it goes.

Finishing & Compliance

Next, your chosen finish will be applied - galvanised, powder coat, painted, or Raptor. The engineering certification will then be arranged where required for ADR compliance.

05

06

Delivery or Collection

Delivery or Collection — Your trailer is then available for collection from our Campbellfield workshop, or delivery arranged, with realistic timelines communicated at quoting stage.

New to this? We’ll guide you through it — no jargon, no pressure, just a straight conversation about what you actually need, wherever you’re at in the process.
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Proof, Not Just Promises

  • ADR 62 compliance
  • AS/NZS welding standard
  • 3-year frame warranty

"High quality well made product and the service I received from 'Bal' a sales rep was above and beyond!"

"High quality well made product and the service I received from 'Bal' a sales rep was above and beyond!"

"High quality well made product and the service I received from 'Bal' a sales rep was above and beyond!"

Have a question?

Frequently Asked Questions

What types of trailers does Mountain Chassis build?
Flatbed, box, plant, tradie, camper and purpose-built trailers, in our Campbellfield workshop, all built to the specific job rather than picked from a fixed range.
Yes, that’s the default, not an upgrade option. Tell us the load, the use case and anything specific you need, and we’ll design around it from the ground up, with everything pre-approved before we start.
Yes. Plant and tradie trailers especially are built for regular, everyday commercial use, rated for the load and conditions of daily work rather than occasional weekend use.
Australian-sourced steel, selected for the load and application, welded to AS/NZS standards.
Yes, trailer’s coupling and drawbar are ADR 62 compliant, we provide a traceable certificate with the build.

Yes, — visit our dedicated Repairs & Upgrades page.

We don’t publish prices as every trailer’s cost depends on type, size and finish. Get in touch and we’ll walk you through an honest, itemised quote.

Need Something Else?

Building a caravan, not a trailer?

Need suspension or coupling work?

Got an existing chassis or trailer that needs fixing?

Ready to Talk About Your Build?

Get a straight answer on your custom caravan chassis, trailer, suspension or repair job — no jargon, no pressure, just a direct conversation with the workshop team.
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