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If there are any questions as per how much your rims are rated for psi all you have to do is crawl under your unit or pull a tire and rim off and check the back of your rim. The rating is stamped on the rim and will tell you which tire pressure your rim is rated for. In some of the seminars that are put at the National Fall Rally by Tredit (the supplier of tires and rims for Keystone) it has been recommended to use the proper tire inflation per your rim. Under inflation can cause just as much damage to a tire as over inflation and I think the Sailun tires (if you are putting on the G rated ones) are rated at a110-120 psi rating. Yes, you can run them at 80 psi but they will heat up faster and wear faster because of this. We have a 2013 unit and our rims are aluminum and they are rated at the 110-120 rating. The Mountaineer may have a steel rim and rated at the 80 psi, I don't know for sure but contact the manufacturer of the tires or look up the pressure ratings suggested by the manufacturer to be on the safe side. Good luck and happy glamping!
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