Tuesday, Feb 21, 2012 at 09:55
Van
suspension and corrugations is an interesting conundrem.
I have travelled extensively with our BT in company with a Trakmaster with coil/shock
suspension, and a Spinifex with coil/shock
suspension. I took a video to compare our BT and the Trakkie going slowly over large washouts in QLD Gulf country and the Simplicity on our BT was far better. The wheels stayed on the ground all the time whereas the coil/shock
suspension had one wheel dangling in the air through each washout.
Corrugations are a different story and complex.
The front wheel on the Simplicity has to punch the corrugation head on before it gets any upward movement to rise over the corrugation, so I have to go slower. All four wheels on the coil/shock
suspension get flicked up by the corrugations and rise over them without the initial punch, so they can go a bit faster. The Trakmaster we travelled with on the Tanami was able to go faster, but they spent considerably more time tightening things up than we did after the trip was over. That was a reflection on the build quality of the rest of the van, not the
suspension.
We drove down the full length of the Tanami in 1994 just in a Landcruiser, no van, and we drove fast and just skipped over the corrugations. You can't do that with a van. It's low (tyre pressures) and slow (speed). Remember you are dragging a 3500kg pendulum behind you, it's not being driven, it's being dragged.
BUT (there's always a but), you will have to replace the shockies in a coil/shock
suspension very regularly because they will just wear out and fail on a long trip over corrugations. And no matter what
suspension you choose, if it has to support 3500kg, or more, of caravan then it will transmit damaging shocks and vibrations up into the inside and damage will occur, even if it's only to drawer runners and locks etc.
If there was a perfect
suspension to suit all of the terrain Australia throws at our vans, then every van would have it. Unfortunately there isn't.
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