Hi im new to the forum and to moddin trucks. I recently got a 2005 Chevy Silverado 1500 Z71 package and its 4x4. Im thinking of putting on some bigger tires just for the look mainly not to do too much offroading. I was thinking about some 30's or 31's. Something that would fit without putting a lift on for now. Im looking for any suggestions on tire size and rim size. Im looking more at the super swamper selections and with some 15" rims. Would i need to get a rim with an offset or a certain backspacing if so does anyone know how much. Any help would be greatly appreciated.