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0451 437 007
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Independent, Leaf Spring or Airbag Suspension — Plus the Coupling to Match

Whether you’re speccing a new chassis or upgrading what you’ve already got, Mountain Chassis fits and retrofits suspension and coupling systems from our Campbellfield workshop — matched to your actual load, terrain and tow setup.

We regularly fit McHitch and DO35 couplings, ADR 62-compliant drawbars, and suspension retrofits for caravans and trailers across Melbourne and Victoria.

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Get the Spec Right the First Time

Suspension and coupling decide how a caravan or trailer actually rides, tracks and lasts. Get it wrong and you’re looking at premature tyre wear, chassis fatigue, and a tow that fights you the whole way home — problems that show up months later, not on day one.

Mountain Chassis fits and retrofits independent, leaf spring and airbag suspension, plus the full range of couplings and drawbars, matched to your load and where you’re actually travelling.

This isn’t only a new-build service. If you’ve already got a van or trailer that’s under-specced for what you’re now asking of it, we can assess the existing setup and retrofit from there.

Welder MIG welding a custom caravan chassis rail in the Mountain Chassis fabrication workshop, Melbourne.
Welder MIG welding a steel chassis frame on a fabrication jig in the workshop.

Who We Build For

  • Owners upgrading an existing van or trailer — assessed and retrofitted, not just told to buy a new chassis
  • Custom builders specing a new build — suspension and coupling designed in from the start, matched to the application
  • Caravan manufacturers — consistent, ADR-compliant coupling and suspension fitment across production runs
  • Trades and repairers — a partner for suspension and coupling work that sits outside your own scope

Not Sure Which Configuration You Need?

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Suspension Options We Specialise In

Independent Suspension

Each wheel moves independently, meaning better articulation and ground contact over corrugations and rough terrain, and the gold standard for serious off-road caravan suspension and rough-road touring
  • Single and tandem axle configurations
  • Load-rated to match your ATM
  • Best suited to off-road and rough-road applications
  • Pairs well with airbag suspension for load-levelling

Leaf Spring Suspension

The proven, cost-effective workhorse — simple, robust, and easy to have serviced anywhere in Australia.
  • Slipper, eye-to-eye and rocker-roller shackle configurations
  • Lift kits and ride-height modifications
  • Load-assist and helper spring fitment
  • Shock absorber and spring upgrades

Airbag Suspension

For serious remote and unsealed-road travel. Heavier-duty construction, engineered to handle sustained corrugations and rough terrain — built to your actual application and load, not a generic “off-road” label.
  • Push-button height adjustment
  • Auto-levelling kit options
  • Compensates for variable loads and uneven ground
  • Pairs well with independent suspension

Custom & Retrofit Suspension Options

Unusual application, heavy hauler needing uplift, or an existing setup that needs re-engineering, we design and build to suit.
  • Engineering certification arranged where the build calls for it
  • Mounting point reinforcement for retrofits onto an existing chassis
  • Post-modification alignment and geometry checks
  • Works with what you've already got, not only new builds
Close-up of independent coil-over suspension and brake hub fitted to a caravan chassis.

Couplings & Drawbars

Suspension is only half the job — the coupling and drawbar do the work of connecting tow vehicles to trailers safely. We fabricate and fit:
  • ADR 62-compliant drawbars
  • Off-road articulating couplings, including McHitch, DO35 and similar
  • Standard ball couplings and pin-type hitches
  • Drawbar extensions and modifications
  • Override and electric brake controller integration
Get a Quote on Coupling or Drawbar Work

How It Works

How Suspension & Coupling Fitment Comes Together

Enquire

Tell us what you're towing, where you actually drive, and whether this is a new build or an upgrade to something you've already got.

01

02

Assessment

For an existing van or trailer, we inspect the current chassis, suspension and mounting points before recommending anything. For a new build, we work from the chassis spec already underway.

Recommendation & Quote

We recommend the combination that actually suits your load and terrain — not the most expensive option — then quote it, itemised, before anything starts.

03

04

Fitment

Carried out at the Campbellfield workshop. Mounting points reinforced where needed, then suspension and coupling fitted.

Geometry Check & Handover

Alignment and geometry checked post-fitment, not assumed. Ready for collection or delivery.

05

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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Social Proof

Hear From Those We’ve Worked With

  • 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

Can you retrofit off-road suspension to an existing caravan?
In many cases, yes. We assess the existing chassis, design and fit independent off-road suspension, upgrade the coupling if needed, and reinforce mounting points where required. Whether it’s worth doing depends on the original chassis design; we’ll give you a straight answer either way.
Independent suspension gives each wheel its own movement, best for off-road and corrugated touring. Leaf spring suspension is the simpler, more cost-effective option for on-road and general-purpose use. Airbag suspension adds adjustable ride height and load-levelling, and pairs well with either of the other two. Give us a call and we can discuss what’s most suitable for your needs.
The full range: standard ball couplings, override couplings, electric brake-compatible couplings, and off-road articulating couplings including McHitch and DO35. We’ll recommend the right one for your application.
Yes. We provide a traceable ADR 62 compliance certificate where required.
Yes. We regularly assess and upgrade chassis, vans and trailers we didn’t originally build, including retrofit suspension and coupling work.
It depends on the setup and what’s actually needed, so we don’t publish prices for that reason. Get in touch and we’ll assess it properly before quoting. There’s no obligation to work with us.
Work carried out by Mountain Chassis is covered by the same 3-year frame warranty. For standalone retrofit work, we’ll confirm the applicable warranty as part of your quote.

Need Something Else?

Need a new caravan chassis, not just suspension?

Got an existing chassis or trailer that needs fixing?

Building a trailer, not a caravan?

Not Sure If It's Worth Upgrading?

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 Tell us what you’re driving, towing and where you’re headed. We’ll give you a straight answer, even if that answer is “leave it as is.”team.
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