Tire PSI and truck camper question

jadatis wrote:
Your tires are most likely Standard load P-tires, and on those they only give maximum allowed cold pressure.
The maximum load of tire can be carried up to 99m/h AT 35 psi , wich is standard reference-pressure for P-tires SL. So if you drive only below 99m/h you may use the 35 psi.

The space between 35psi and 51 psi is used to highen up the referce-pressure ( further AT-pressure) for higher speed then 99m/h with a system depending on speedcode of tire. Also for alighnment camber angle above 2 degr.

LT tires give on sidewall the AT-pressure , and in earlyer days higher was allowed and even adviced upto 10 psi extra, but nowadays the tiremakers dont allow it anymore, and so the AT-pressure is the maximum allowed cold pressure.

So tiremakers allow for SL P-tires a higher pressure then AT, and if you use it to cover some higher load on tire then maximum load, they cant prove you did it for that higher load then max ,that they dont allow, but mother nature will be happy with it.

To high pressure gives that less deflection of tire, that things go bumping, so to high is not bad for the tire, but bad for your kidneys and teeth-fillings.

I seemed to have given a wrong idea, so will add this post.

As long as I did not get comfirmation of exact tire-specifications, I will assume you have P-tires in Standard load.

Those will be even a bit overrated for the gross axle weight rating at rear, wich would even alow a lower pressure then 35 psi.
But I always add 10 % to the real axle load , also for LT tires.
This to cover unequall loading R/L in combination with a bit higher weight then estimated.

If you would weigh the axles, or better seperate axle-ends ( wheels), the inacuracy is already less.

If then the pressure goes over 35 psi , you better fill that, and for P tires its allowed up to 44psi sometimes, and in your case even 51 psi.

For LT-tires the comparable 35psi is given on sidewall and called reference-pressure, but I will call it AT-pressure furtheron.
So AT-pressure(cold) is something else then the maximum cold pressure.
In earlyer days, the tiremakers allowed for LT higher then AT-pressure , but nowadays not anymore.
Strange but true.

But your tires are allowed higher then AT because on sidewall it says so ( AT 35 psi maxcold 51 psi).
but because 35 psi is already with a maximum reserve, the 51 psi would give a terrible discomfort.
For savety of the tires though , 51 psi is never bad, mayby sooner punctures . But if you can give me all the details,mayby the pressure can even be save lower then 35 psi.