Bill and Sue, you need to take a look at the back side of the wheels. Info should be on one of the spokes as to load limit and max pressure. My guess would be that since it's a 2011 that you're good to go. I have put 614's on my 2010 as the rims are rated for 110 psi, but knowing the way business is done, I would check to make sure first.
Regards,
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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