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Costco does not sell BF All Terrain tires for 2003 H2 but do sell them for all other years? Did the load rating change after 2003 and does it make a difference?
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Costco won't install any tire that isn't an original size for your vehicle but tire rack (no sales tax) has them http://www.tirerack.com/tires/TireSearchResults.jsp?tireIndex=0&autoMake=Hummer&autoYear=2003&autoModel=H2&autoModClar=&width=315/&ratio=70&diameter=17&sortCode=51155&skipOver=true&minSpeedRating=R&minLoadRating=XL&tab=All and have them shipped to one of their authorized installers, I use Nielsen Automotive in San Carlos (36 five star ratings on yelp)