The factory 245/70R17's are ok for what they are, but they aren't proportionate to the wheel gap. Now there's an '05 outside without a lift, and he's sporting 265/75 tires, and they look absolutely mean. Are there any dimension differences between the 2 body styles that wold restrict me from going that big? Or can I go bigger? Truck in question is an 07 Sierra RC/LB I've read the stickies, but they do not help with the size tire I'm looking for. I'm running on the factory rims, and i don't know their width. Someone point me in the right direction?