This doesn't apply to all Prevost coaches, but it does some. I'm pretty sure it applies to all XL models.

Michelin Information (CLICK HERE)

What's a bit strange with this recently released bulletin is that they use to publish 2 tire pressure charts to cover this vary thing.

Here's the normal inflation chart for your comparison (CLICK HERE).

Also, don't forget that inflation pressure is set when the tire is cold and that the Michelin chart states the recommended MINIMUM tire pressure.