The axle weights (per the previous owner) suggest 85psi front, 80psi rear, using Goodyear's table, IF the weight is evenly distributed left/right (unlikely). So bumping those numbers up to 90 front, 85 rear is what I would likely go with till I got a new weigh done with MY load.
However, I see a dilemma here. The coach manufacturer's sticker says 80psi, front and rear, and since those numbers are (normally) based on the maximum GAWRs, it suggests that your coach's front axle may very well be overloaded (assuming that your current tires match the size listed on that sticker). You need to get on a scale, sooner, not later, to verify what you have to work with.