Tyre pressure too high?

an old fashioned way of checking tyre pressures-

get some chalk and cover the tread in a band of about 2-3" wide 90 degrees to the sidewall, go for a short drive.

check the chalk band,

if it is worn in the middle = overinflated

if it is worn on the edges = underinflated

if the band is worn evenly across the tread = perfect

This comes up regularly and is an issue for many motorhomes. If you can find a public weighbridge then they will write down front and rear axle weights for free although if you want a ticket you have to pay. Use manufacturers’ tyre data.

My front tyres were way too high and the ride has been transformed by reducing the pressure down to the values quoted by Continental. Unfortunately, for Peugeot (Autosleepers), the weights stamped inside the near side door column are the base vehicle not the converted coachbuilt so are too high. Can’t reset the warning signal though which is another big issue.

I had that issue with my Marquis. Experimented to find the lowest I could go without the warning appearing every time I switched the ignition on.

When we had our Autocruise,  in the back of the owners manual was a chart with recommended front and rear tyre pressures for every model in their range,   all were lower than the base vehicles plate fitted to door piller 

A Motorhome is almost always loaded to the maximum allowed, or even over that. 

So the list JVB66 has is most likely for the base vehicle. 

Rear axle is often overloaded in combination with unequall load R/L, so needs often higher pressure then written on sidewall, because tyres are mostly yust enaugh to cover the Max Permissable Axle Weight( MPAW) . 

Front though stays below MPAW , even when overloaded, so can do with much lower pressure.

Only busconversions often use MPAW front fully, because they have shorter overhang behind rear axle.

So my endconclusion is that you most likely have to use the advice given on plate in the motorhome, because that is determined for MPAW's, behind even higher. 

Be verry carefull with going lower in the pressures. 

A radial tyre stays within a large range with total treath-with on the ground, so even when chalk wears of evenly, you can still have overheated tyres.  Only once overheated, beginning crackes  are made, wich teare further in time by the normal mechanical forces, whatever you do after that.  Then mayby only after 3 years that far, that tyre blows, or treath seperates, and then that once conditions in wich tyre overheated , is long forgotten, and cheap tyres are blamed.

It was for each conversion,   rather than the max tyre pressure of the base vehicle,   which is what others are suggesting is not required for most coachbuilt /panel van conversions

Forgive me if I misunderstand, my technical English is not strong.

But coachbuilt /panel van conversions is that the usual buildup wit wood and alloy plate on outside? 

If so , that is what I mean with the normal motorhome and not busconversion with metall all around. 

And for those in general rear higer pressure then max on tyre, wich is not allowed anymore, on CP tyres they give higher pressure. 

But front often can do with 4 bar/ 60 psi , sometimes even as low as 3 bar/44 psi.  But first let me calculate it for you

Then better comfort, because driver and co-driver are seated  close to the front axle, and better gripp, wich is usefull for braking, wich is most on frontwheels.

Pics show 1) typical coachbuilt motorhome and 2) a typical panel van conversion.

Then I understood right. 

The coachbuild has a much larger overhang behind then the pannel van conversion. This gives much weight on rear axle and low on front. For the pannelvan conversion , weight division front/rear, is more equall, so needed pressure too.

Once determined that the coachbuild has total gravitypoint ( better line) about 41 to 44% of total length from front.  The pannelvanconv 45 to 48% because of the metal body wich is more heavy. 

But because rear axle is more to the back relatively, the weightdivision over the axles is more equall. 

Temperature in my car is a bit high. ShouldI turn it down?  Or ask for advice on a forum?  Help for the helpless.