tyre pressure over corrugations

Yes and yes, but you need to reduce your speed to match... how much will depend on what tyres and what load.

Absolutally. We carry a fair bit of weight around with us and generally have the tyres at 42psi on the highway. I drop them down to 29-30psi for corrugations, even lower if they are really nasty and it's like someone has just graded the road. Never had a problem doing it, I use the stauns to drop the tyres and have an air compressor and air tank to pump them back up again after.

I always drop my tyres to 25psi for any dirt roads inc corros...
If we get to blacktop and it is only a 100kms or 200kms till out next stretch of dirt i just motor along doing 60-70kmh...
That info is for most northern dirt roads,,, having said that there are plenty that i would keep my pressures at 38psi...
A dirt road with minimal rocks and stones with few corros i wouldnt even bother letting them down..
People come to grief by not slowing down for dips on dirt roads and the rocks at the bottom of those do the damage at speed..

For any dirt road, I drop to about 25-27psi.
On bad corrugations I go lower. I'd rather risk tyre damage than damage the vehicle.

How low is too low??? I did the Anne Beadell Hwy once at 18psi in a 49 degree heatwave, and a couple of months later found the odd bulge on the inside of the tyres from delamination. So I guess that was too low. These days I run low 20's on corrugations, and usually travel at up to 50kph.

The type of shockies you run makes a big difference medium shockies seem to be a good allrounder.

I currently run 4 trucks 1 Troopy and 3 100 series daily, over 100 ks of the very corrugated Jim Jim road, I run 9 persons in the troopy, 7 in the 100 series, I run my tyres at 40 front 42 rear and have done so for years.

I have no intention of changing this method any time soon, as I have worn out 11 sets of tyres at aprox 55000 ks with no problems.

Cheers steve.

Bridgestone A/T duellers 265/75/16 693s Ozi made.

Never leave home without them.

Cheers Steve.