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There is a good article in FMCA mag this month on tires. The mfgr should be calling the shots on this, w/a recommended pressure for the model & loading. W/a coach of this type, you can add weight only in certain places, and most of the addable weight is in tanks. So the coach mfgr is in a position to calcualate the theoretical tire pressure to maintain the optimal tire contact patch for handling w/out having an underinflated tire.
Until you can get your hands on that info, the tire max pressure minus 5 or 10# is probably a good default, but you will probably have a stiffer ride & somewhat worse steering response due to overinflation. If the tires are old, this is not a good idea (old is 6+ years or w/visible sidewall cracking).
My front tire max pressure is 115#, and I run them between 85 and 90 based on an actual scale weighing of the front & rear axles. Drives great and no odd tire wear. (I don't have an Alfa, so YPMV)
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Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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Now I will try to answer your question. The first thing you should do is get your coach weight at a truck scale. Check your axle weights an see if your load is balanced over your axles. Next check your tire inflation tables for the tires you have on your coach. I think you will find that the tire pressures on the table will change from what you have right now. The correct pressures will give you a better ride an increase the life of your tires. If your tires are under inflated it will shorten the life of them an you could run the risk of a blowout. Your need to know of your correct inflations is very important to you.---"007"
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