WHD and Polyairs (or similar)

Here goes .. no expert but this works for me.

I have Firestones on the rear (F250 dual rear wheel). I use WDH on the bitumen (of course) with about 50psi in the bags. On a dirt road with corrugations I take the pressure right down, sometimes to about 20psi, this provides a much more fluid ride for the van and allows the suspension on the truck to work in harmony with the van's. The effect of this is to transfer much less jarring and jolting through the tow bar to the A frame of the van. In short a much smoother ride. Of course if there is to be some more serious angles involved eg crossings etc then the WDH come off. Hope this helps.

John

We have been towing our 18' BT for about 5 years now and over a mixture of roads & tracks and at speeds that the conditions dictate. Rarely go over 90kph on the bitumen though as we're never in that kind of a hurry, and if we do it's usually to relieve the frustration of following traffic.
We used WDH's on previous vans but never felt the need for them on the BT either for levelling or stability. Our first 100 series had heavier rear coils with heavy duty shock absorbers. The springs had about a 1 1/2" lift and sat up a bit when not loaded or hitched up but was level and travelled perfectly when towing.
On our current 100 series we decided to give air bags a go (mainly because Jude didn't like the way the previous "Cruiser" sat up at the back when unloaded), we run them at 5 - 8 psi when the load is off and at 35 psi when loaded and hitched up and the rear tyres to about 42 psi. Rear springs are standard but thinking of upgrading them as the van, with this set up (airbags), does dip slightly but we still do not have any stability problems and the slight "dip " I know we can over come with a more suitable spring choice.
Anyway, it works for us and we don't have the creeking and groaning the WDH's produce when turning and don't have to decide if we should have them on or off depending on track/road conditions..
So thats about it, hope it's a help if not food for thought,

Cheers Judy & Tony Quebec 1257 (Sel 1257)

HI Sooty,
I agree with the comments posted and each to their own, I use a wdh hitch and only a 16ft van and this to stop the porpose effect in the single cab effie, i run my rear air bags at 50psi and my front at 25, when fully loaded and 5-8 psi when running on empty, i bought my bags out of the states, front and rear landed here with a full set of Rancho shocks for $500 less than i could buy here for the bags alone.
Regards
Frank