Cummins12V98 wrote:
I agree but I will add by saying to add 10 psi to the front chart spec and 5psi to the rears.
For most class C's, adding 5 psi to the rear tires over the chassis manufacturer's recommendations (i.e. the door sticker) will put the tires exactly 5 psi over their maximum inflation pressure. The rear axle weight rating is the maximum for the standard tires at their maximum pressure of 80 psi. It's fairly likely the wheels are also rated for a maximum of 80 psi.
Would 5 psi higher than the rating be dangerous in practice? Probably not...but still it's hardly a good idea.