Mike, I would have the coach re-weighed after the ride height, and tag bag pressure had been checked. We have seen some significant variances in scales, and we had a Newell that we sold, and by adjusting the ride height & tag axle pressures were able to correct a 1,500lbs. overweight on the front end. This coach went to Newell, and they also re-rated the front end for an additional 2K lbs. with different front tires. I would also check with Prevost to see if they will tell you what the limiting factor is. It is not a big deal ($4K) to put the 365 upgrade on the front end. That will get you closer but if the axle is a 16K axle you are significantly over. And as John stated you will likely have other components that may be undersized for that weight. If you love the coach, you may check to see what the cost would be to change the front end to the current configuration. If the coach still has the beam front axle (98 chassis & older on an H) it would likely not be possible.
Steve & Rhonda Bennett
Dana Point, CA
92 Marathon XL40
2012 Jeep Rubicon Unlimited
Owner: California Coach Company, LLC