My sticker says to inflate to 100psi (2001 Mirada). When I look at the tire pressure / weight table for my particular tire, 100 psi is the highest pressure recommended for any weight the tire is designed for. I suspect this is a generic pressure (100psi) and Coachmen simply tells everyone to inflate to this pressure.
HOWEVER - After I weighed my MH fully loaded and got the weights for each axle, I then looked at the tire pressure-to-weight tables for my actual weights. I found I could operate all 6 tires at the minimum recommend tire pressure of 70 lbs. (The lowest recommended tire pressure for that tire)
I chose to inflate all my tires to 75psi, which is well above the minimum for my tire and weight, and I believe contributes to a little smoother ride.
2001 Coachmen Mirada (Ford F53 6.8L V10) - Toad 2001 Civic
It won't do MACH 2, but I can get a sandwich and take a pee.