Tyre pressure

What does the van and MH manual state?

Both my mnauals state 79 PSI so I tried that but had to reduce to 70 on the front, was creating to many rattles and bangs and wearing the middle of the tyre on the front.

HI all had to reduce the presure all around onthe hymer was afraid the windscreen would fall out on bad roads ,they get a little warm after long journey .I tried blowing them up but no good eyeballs falling out.Had to reduce the presure again, back ones ok they are twins on each side.
they take the waight better .

Registered to this forum to react here.
Live in Holland and once got hold of the formula that the tyre- and car-makers use to determine pressure for a sertain load, and the reversed one is used to make pressure/loadcapacity lists you sometimes find.
Went running with it and learned myself Excell to make spreadsheets for it, and translated a few to English to go worldwide with it.
Got much to know about tyres an tyre-pressure in time.
Even constructed my own universal formula from wich this official can be made but also an alternative one I found of an american IR J.C.Daws.
I now use that formula with the power and construction load I think is best, and takes care that the deflection of tyre stays the same over the whole range , wich is also the goal of all calculatations.
Wont introduce myself in a seperate topic here, dont have a camper anymore and only will react on tyre-pressure and tyres.

Now my reaction.
I can calculate the needed pressure with my made Motorhome-calculator, but need some data from you.
This is MPAW abd MPVW ( Max permissable axle/vehicle weight) or real weighed loads.
from tyres the maximum load or loadindex and pressure needed for that/maxloadpressure/reference-pressure Pr wich is not the maximum pressure of tyre.
In Europe 80 psi is seldom used, so I suspect its a special camper tyre wich states max80 psi on sidewall but is realy a D-load/8PR tyre with Pr of 65 psi or 70 psi and the 10 psi extra is to cover peak loads a Michelin answered me once.
So first you have to determine that.
If you see on sidewall "maximum load xxxx kg AT yyy PSI ( cold) " then the yyy is the Pr and not the Pmax.

I estimate that your tyres need front that 4 bar/60 psi but rear 80 psi is needed because rear is often overloaded for campers and even weightdifference R/L wich makes weight on one tire go over sometimes maximum load of tyre.
With that then no bumping but maximum reserve .

I wont give a picture or link in my first post , because most fora dont allow that.
Greatings from Holland
( Ja dat is ) Peter ( Yeah thats Peter, from a dutch name song of the 1960's stil sometimes refered to)

I put Hankooks on my Ducato X230 rated 3200kg. Gave Hankook my axle limits and they recommended 52 front, 54 rear. Tyre max is 65 psi. Handles fine wrt tyres.

Thanks for all that,

When on the motorways in Connemara there's a bit of trial and error needed otherwise you will be visiting the dentist on your trip home

I think you will need to adjust the pressure to suite the roads most travelled and then find the happy medium,

Yet again I'm impressed with the generosity of this forum and respondants. I'm going to study replies in detail with a clear hand...no beer in hand! Very grateful to all...GRM {Go Raibh Míle (Maith Agaibh)} A thousand Thanks!