I own a 2010 Sierra All Terrain.

Im wondering what my options are on tire sizes that will fit without altering any other part of the truck (suspension, body, etc).

The stock tire size is 265/65-18 and there are not too many options in that size for a decent A/T or more aggressive off road tire. Could I run a 275/65-18 or a 285/60-18 without any issues?