I also have 37x12.5s. I have a rub issue on one side with the back of the wheel well, sounds like crap when I turn but no harm done.
I can't give you exact numbers on clearance, but I've had non-Hummer owners come up and ask me why my H2 looks "bigger" than other ones they've seen. So the difference is noticeable even to a layman.
Stacy
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2003 yellow Lux, 12" Bulletproof lift, 42" Pitbull Rockers, 20" Ultra Predators, Corsa sport exhaust, painted interior
2004 Cadillac Escalade, white diamond, dual tip chrome exhaust, 20" chrome 9-spoke rims, altezzas - TOTALLED!!!! Replaced with a nondescript 2009 Chevy Tahoe
1970 VW Karmann Ghia, black with a flame job and too many mods to list
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