There are a lot of coaches, especially coaches with a tag axle that require higher pressure in the front tires than in the drive axle tires.
As for the problem of wearing out the center of the front tire from over inflation, I do not believe that it will ever be a problem on any of our coaches. Very few of us ever get our tires more than 50% worn before we need to replace them because of excess age, unless there is an alignment problem with the suspension.
Gerald