Corrugations will beat your rig before the track does: how to actually drive them

I lost a fridge compressor bracket on the Gibb River Road three years ago. Not from a rock strike, not from a water crossing — from forty minutes of corrugations near the Pentecost River crossing that I drove about 15km/h too fast because I was tired and wanted to make camp before dark. The bracket cracked, the fridge kept running but rattled itself into an early grave two months later. Corrugations don't announce the damage. They just quietly work every rivet, weld and fastener on your rig until something lets go, usually a long way from the nearest workshop.

Everyone talks about tyre pressure on corrugations, and that's real, but it's maybe a third of the story. The rest is speed, load distribution and knowing when to just stop and wait for a better window. After a few seasons doing the Gibb, the Tanami and long stretches of the Anne Beadell in a Troopy with a camper on the back, here's what I've actually learned works, as opposed to what gets repeated in Facebook groups without much thought behind it.

What corrugations actually are and why speed matters more than people think

Corrugations form because a vehicle's suspension has a natural bounce frequency, and as wheels hit small bumps at a certain speed they start reinforcing that bounce into the road surface instead of absorbing it. Every vehicle that follows compounds the pattern. It's basically a feedback loop between traffic and dirt, and it means the corrugation spacing on any given track is roughly tuned to the speed most vehicles travel it at.

That's why "just go faster and skim the tops" sometimes works and sometimes is a disaster — it depends entirely on the corrugation wavelength for that particular section, which changes with soil type, grader history and how long since it last rained. There's no universal magic speed. What there is, though, is a method: start slow, around 40-50km/h, feel how the vehicle responds, and nudge up or down in 5km/h increments until you find where the ride smooths out. On some sections that's 60km/h. On others it's 35km/h and no amount of extra speed helps. If you can't find a smooth band at all, the corrugations are irregular (common after recent heavy vehicle traffic) and your only real option is to slow right down and accept the shake.

Tyre pressures: the range that actually works, not a single number

I run my Troopy's rear tyres down to around 22-26 PSI for sustained corrugations, depending on load, and the camper's tyres come down a similar amount from their highway pressure. The exact number depends on your tyre's load rating and your GVM, so I won't pretend there's one figure that suits every rig — check your tyre's sidewall rating and your loaded axle weights first. What I will say is that most people don't drop pressures enough, and almost nobody re-checks them through a long corrugated stretch as the tyres heat up and pressure climbs back toward highway figures.

The other thing nobody mentions: dropping pressure too far on a heavily loaded van or camper risks sidewall damage on the sharper edge sections, especially where corrugations sit on hard-packed clay rather than soft red dirt. Soft sand-based corrugations (a lot of the Cape Leveque Road, for instance) are more forgiving of low pressures than the harder-packed sections further inland. I'd argue the "just drop everything to 18 PSI" advice you see online is fine for genuine soft sand but risky as a blanket rule for corrugated clay pans, where you want a slightly firmer tyre to protect the sidewall.

Load distribution matters more on corrugations than almost anywhere else

Corrugations expose bad loading faster than any other road condition. Heavy items stored high, or unevenly side to side, turn a manageable shake into a genuine handling problem because the vehicle's roll centre and the corrugation's rhythm start working against each other. I keep water, tools and anything dense as low and as central as I can in the Troopy, and I've moved things around mid-trip more than once after noticing a shimmy that wasn't there on smoother ground.

If you're towing, this goes double for the van or camper. A tow ball weight that's fine on bitumen can translate into a pitching, snaking motion on corrugations that fatigues the coupling and chassis. This is one of the reasons the pre-trip checks matter as much as the driving technique — if your hitch-up routine isn't tight and your weight distribution setup is marginal, corrugations will find that weakness within the first hour.

What actually breaks (and how to check before it costs you)

In order of what I've seen fail on corrugated tracks across the Kimberley and Centre: cabinetry screws and hinges inside vans, fridge compressor mounts, jerry can brackets, number plate mounts, and — the expensive one — wheel bearings that were already marginal before the corrugations found them. None of these fail because corrugations are extreme; they fail because something was already loose, worn or under-torqued and the vibration is relentless in a way potholes and rocks aren't.

Before any long corrugated run I do a walk-around: check every external latch, run a hand over jerry can straps, and give the wheels a shake test at each hub. It's the same logic behind a proper wheel bearing check — you're looking for play that wasn't there last time, because corrugations will turn a small amount of play into a failed bearing over a few hundred kilometres. I'd also check your van's suspension bushes if it's leaf sprung; the difference between independent suspension and leaf springs genuinely shows up here, with leaf setups needing more frequent bush inspection on sustained corrugated running.

Reading the track ahead instead of reacting to it

Watching 50-100 metres ahead rather than the bonnet gives you time to see where corrugations change character — tighter, looser, softer edges near a creek crossing. Dust from an oncoming vehicle also tells you something: heavy dust hanging low usually means loose, dry corrugated surface: a good cue to back off pressure expectations and speed both.

On tracks like the Gibb River Road the corrugation severity genuinely varies section to section depending on when it was last graded, and the same applies to remote crossings like the Anne Beadell Highway, where you might go 40km on a smooth graded section and then hit an unmaintained stretch that hasn't seen a grader in a year. Checking recent trip reports or calling the relevant shire before you commit is worth the five minutes it takes, particularly on the more remote desert routes where a grader might not have been through since the last wet.

When to just stop

Sometimes the honest answer is to pull over, put the kettle on, and wait. Corrugations wear you down mentally faster than physically, and driver fatigue on a shaking, noisy track is a genuine safety issue, not just an annoyance. I've pulled off for twenty minutes on the Tanami more than once purely because my hands were starting to go numb on the wheel and my judgement was following. There's no shame in it, and it's cheaper than a cracked chassis mount.

If you're running the Savannah Way or heading into the Kimberley on the Gibb River Road Adventure, budget extra time specifically for corrugated sections rather than assuming you'll cover the same ground per hour as sealed road. Rushing a corrugated stretch to make camp before dark is exactly how I lost that fridge bracket, and it's a mistake I see other tourers make constantly because the itinerary says a certain number of kilometres per day and the track doesn't care what the itinerary says.

A rough pre-corrugation checklist

Before any sustained corrugated run, I run through the same short mental list: pressures checked and noted, loose items secured or repacked low and central, tow coupling and safety chains rechecked, wheel hubs given a shake test, and fuel and water topped up so I'm not making decisions about range while also managing a shaking vehicle. None of this takes long. All of it is cheaper than a roadside repair or a tow.

Corrugations aren't dangerous in the way a bad water crossing is dangerous. They're slower, quieter, and they get you through fatigue and neglected maintenance instead. Respect that and the actual driving part is fairly straightforward — find your smooth speed band, keep the load low and central, and don't be afraid to stop.